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Language, its vocal articulations
imitated by instruments, 148;
tongues, 221

La Place, 21, 33, 61, 83, 92, 115
Laroche's experiments in optics,
179, et seq.
Latitude, degrees of, 45,
Leyden jar, the, 231, 275
Light, mode of measuring its
transit, 28; its analogy with
sound, 118; atmospheric ac-
tion on, 129; the sunbeam and
prismatic experiments, 136;
the Newtonian theory, 143;
its ethereal medium, 145, 170;
allied with rays of caloric,
179; from caloric, 188
Lightning, 231
Magnet, the, 244
Magnetic pole, the, 241
Magnetism, theory of, 240, 269
Malus, M. optical discovery, 174
Man, frame of, 196; species of,
221

Marine plants, 217
Mars, the planet, 54, 197
Matter, properties of, 99; tem-
perature of, 187

its molecular action on

light, 169
Measures, standard of weights
and, 85

Melloni, M. experiments, 180 et
seq.

Mercury, 263

the planet, 199, 302
Meridian, terrestrial, 45
Meridians, whether elliptical,
47; length of a degree, 48
Metals, dilation of, 190
Meteoric stones, 312
Milky-way, the, 55, 305
Mirage of deserts, 133
Momentum, primitive planetary,

15

Moon, the, 30; distance of, 52
,new, 36

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luminous spots of the,

Moon and earth, reciprocal in-
fluence, 9, 35, 63; calcula-
tion of distances, 40; dimen-
sions, 57; theory of tides, 87
Mountains, deposits on, 70;
height of, 105; influence, 202
Muscular strength, 107
Music, elements of, 122-129;
musical articulation, 129
Nature, the laws of, 314, 318
Nautical Almanac, 40
Navigation, new astronomical
aid to, 27, 40
Nebula; clusters of stars, neb-
ulous, and of great magnitude,
306, et seq.

Needle, the magnetic, 241
Newton, 5, 20, 43, 143, et seq.
Occultation of stars, 40
Ocean, density of the, 72; tides
87; depth, 88
Optics, 136, et seq.
Orinoco, cataracts of the, 117
Otaheite, observations by Cook
at, 53

Pallas, planet, 57
Papyrus, date of a MS., 85
Parallax, definition, 51
Parry, Sir Edward, 98, 241
Pendulum, oscillations of the,
48, 86

Phases of the moon, 36
Phenomena of refraction, 129,
et seq.; prismatic, 136; of pe-
riodical colors, 174

Plane of the centre of gravita-
tion, fixed, 21

Planetary eclipses, 39
Planets, theory of the, 9,
their masses, 55

the minor, 16, 57
orbit varied, 13

rotatory motion, 60

Plants of various climes, 212
Poinsot, theory of M., 21
Polarity of the magnet, 244
Polarization of light, the, 153,
et seq.
Poles, the, 71, 77

Poles, of maximum cold, 210
Precession and nutation, 75, 77
Probabilities, the theory of, 59
Problem of the three bodies, 57
Proportion, law of definite, 103
Quadrupeds, 220

Radiation, principle of, 186
Rain, 188

Rays of light, 130, 154

of heat, 178
Reflection, phenomena of lumin-
ous, 134

Refraction of light, 129; double
image, 156

Retina, images, accidental im-
age, and imagination, 142
Richter's obsevations at Cay-
enne, 51

Rivers, declension in the bed of,
45, 66

Ross, Captain, 241
Rotatory motion, 252

of the earth, 30; of plan-
ets, how proved, 60
Salt, rock, permeable to rays of
heat, 180

Salt and sugar, attraction or ab-
sorption by, 102
Sap, vegetable, experiments, 169
Satellites, law of planetary, 10,

24

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Sun, the, is the centre of uni-
versal gravitation, 10; dis-
tance of, 53; parallax of, 53;
rotation of, 60; the solstices,
83; the sunbeam, 136
Syrup, physical facts, 169
Temperature, observations, 68,
202 et seq.
Thermo-electricity, 267
Thermometer, the, 100
Thunder, 120

Tides, described, 87
Time, mean solar, 80; decimal
division, 80, 86
Torpedo, the, 239
Tourmaline, 155
Trade-winds, the, 108
Universe, the, 21

Uranus, his satellites, 30; dis-
tance from the sun, 54, 198
Vegetation influenced by the de-
crease of temperature, 212;
extraordinary, 213; compari-
son of various examples of,
214
Velocity of light, 28; of sound,
115; of electricity, 120; of
colored rays, 177

Venus, the transits of, 52; cli-
mate of, 199

Voltaic electricity, 235

Vibrations, aerial, 110; of elas-
tic bodies, 122; of sonorous
bodies, 124; of light, 146
Water, a conveyer of sound, 116
Waves, description, 95
Week, 81

Year, the, and the seasons, 76,
79, 82

Zinc, oxidation of, 233

RECENTLY PUBLISHED BY KEY & BIDDLE,

No. 23, MINOR STREET.

MIRIAM, OR THE POWER OF TRUTH.

BY THE AUTHOR OF "INFLUENCE."

This tale is professedly founded on an "anecdote, said to be a well-attested fact, of an American Jew converted to Christianity by the death of his only child, a beautiful girl, whom he had reared with no common care and affection. She embraced the Christian faith unknown to her father, until with her dying lips she confessed to him her apostacy from Judaism, giving him at the same time a Testament, with a solemn injunction to believe in Jesus of Nazareth.” This outline is ingeniously and skilfully filled up, and a tale of deep interest is produced. There are many passages of deep pathos, and the argument for Christianity adapted to the Jews, is happily sustained. We think the pleasure and instruction which the book is calculated to afford, will well repay a perusal. -The Presbyterian.

The style of writing in this volume is simple and beautiful, as the story is affecting.-Boston Traveller.

The book has enough of fiction to enliven the fancy and gratify the curiosity of youth, who might not otherwise read it; while it conveys lessons of piety, and arguments for the man of understanding. We wish that many a lovely Jewess could be persuaded to read "Miriam."-The Philadelphian.

The work altogether deserves to stand high in the class of productions to which it belongs.-Episcopal Recorder.

When we see a book which bears the imprint of Key & Biddle, we are always sure to see a handsome one. In this case, we can give as high praise to the matter as we can to the mechanical execution.

"Influence" was one of the very best of that class of religious novels lately so prevalent in England; and its gifted young author has even improved upon herself, in this affecting and powerful story. She has aken that touching incident, well known through the medium of our tracts, of a Jewish maiden who, on her dying bed, won over her reluctant father to the religion of the Jesus he despised.

It was a subject too good to be left unimproved, and in "Miriam" has been embalmed, one of the most beautiful and delicate religious narratives we have ever read. No one whose feelings and sympathies are uncorrupted, can peruse this touching tale, without feeling a strong interest, and that sympathy which will sometimes melt them into tears. Upon the publication of Miriam in London, it quickly ran through three editions, and we doubt not it will attain a co-extensive popularity here, where there is more freshness of the feelings, and a more deeply imbued spirit of rational piety, to appreciate the fine tone of religious spirit which pervades it.-N. Y. Com. Adv.

AIDS TO MENTAL DEVELOPMENT, or Hints to Parents. Being a System of Mental and Moral Instruction, exemplified in Conversations between a Mother and her Children, with an Address to Mothers. By a Lady of Philadelphia.

A MANUAL ON THE SABBATH; embracing a consideration of its Perpetual Obligation, Change of Day, Utility and Duties. By John Holmes Agnew, Professor of Languages, Washington College, Washington, Pa. With an Introductory Essay, by Dr. Miller, of Princeton, N. J.

COUNSELS FROM THE AGED TO THE YOUNG. By Dr. Alexander.

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THE PHILOSOPHY OF A FUTURE STATE. By Thomas Dick, author of the Christian Philosopher, &c.

TODD'S JOHNSON'S DICTIONARY OF THE ENGLISH LANGUAGE. To which is added, a copious Vocabulary of Greek, Latin, and Scriptural Proper Names, divided into syllables, and accented for pronunciation. By Thomas Rees, LL.D., F.R.S.A. The above Dictionary will make a beautiful pocket volume, same size as Young Man's Own Book.

MEMORANDA OF A RESIDENCE AT THE COURT OF LONDON. By Richard Rush, Envoy Extraordinary and Minister Plenipotentiary from the United States of America; from 1817 to 1825. Second edition, revised and enlarged.

PAROCHIAL LECTURES ON THE LAW AND THE GOSPEL. By Stephen H. Tyng, D.D., Rector of St. Paul's Church, Philadelphia.

THE CHRISTIAN PHILOSOPHER, or the Connection of Science and Philosophy with Religion. By Thomas Dick.

THE PHILOSOPHY OF RELIGION, or an Illustration of the Moral Laws of the Universe. By Thomas Dick.

THE IMPROVEMENT OF SOCIETY, by the Diffusion of Knowledge; or an Illustration of the advantages which would result from a general dissemination of rational and scientific information among all ranks. Illustrated with engravings. By Thomas Dick, LL.D., author of Philosophy of a Future State, &c.

THE PIECE BOOK, comprising Choice Specimens of Poetry and Eloquence, intended to be transcribed or committed to memory.

MEMOIRS OF HORTENSE BEAUHARNAIS, DUCHESS OF ST. LEU AND EX-QUEEN OF HOLLAND.

This is an interesting account of a conspicuous character. She was the daughter of Josephine Beauharnais, alias, or afterwards, Josephine Bonaparte, former wife of Napoleon of France; and she became the wife of Louis Bonaparte, the ex-king of Holland. Of those who have figured at large on the great theatre of life, at one of the most memorable eras in history, many interesting anecdotes are given. We can safely recommend this work to the reading public.American Sentinel.

No one of all those distinguished personages who occupied so large a space in the world's eye, from their connexion with Napoleon, presents a story of deeper interest than the amiable and accomplished subject of these memoirs. Possess. ing all the grace and fascination of manner, which so eminently characterized her mother, the Empress Josephine, she has a strength and cultivation of intellect; an extent and variety of knowledge; and a philosophic fortitude which the Empress never could boast. Unhappy in her marriage, she was yet a devoted wife and fond mother; and though gifted with every quality to adorn royalty, she willingly withdrew to the shades of private life, resigning the crown she had embellished without a murmur.

Many of the details of this work will be found deeply interesting, and the notes are copious and instructing. The translator has faithfully preserved the spirit of his original.-Saturday Courier.

HARPE'S HEAD,

A LEGEND OF KENTUCKY.

By JAMES HALL, Esq. author of Legends of the West, &c. &c.

It is an able production, characteristic of the writer's eminent talents, and abounding with narratives and sketches of absorbing interest. The history of Harpe forms the ground-work of the tale, the incidents of which are developed with much skill and effect.-Philad. Gazette.

Harpe's Head is one of the most interesting stories with which we are acquainted.-Daily Chronicle.

Judge Hall is among the most popular of American writers, and in the present production, has given another proof of the felicity of his genius. It abounds with narratives and sketches of deep interest, relating to the early periods of the settlement of Kentucky.-N. Y. Com. Adv.

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Mr. JAMES HALL, a native of Philadelphia, and favorably known as the author of Legends of the West, has just published a new work, entitled HARPE'S HEAD, A Legend of Kentucky." It is well calculated to add to his fame, and though it bears evidences of being a hasty composition, reflects great credit upon the author. It is the story of Micajah Harpe, a Kentuckian Freebooter, and the scene changes from Virginia, in the olden time, to Ohio and Kentucky. The account of a Virginia Barbecue is so well and naturally executed, that it must become a favorite. It is here inserted as a favorable specimen of the work. Miss Pendleton is altogether lovely.-Poulson's Daily Adv.

With the ordinary characters which must be found in such a composition, we have one quite original being, in the person of "Hark Short, the snake-killer;" and the production, as a whole, forms one of the most engaging volumes that we have met with. To its other merits we should not omit to add that, like other writings from the same pen, it is distinguished by an unobtrusive tone of the purest moral sentiment.-Penn. Inquirer.

We cheerfully commend this work to the attention of our readers, assuring them that they will be amused, entertained, and instructed by its perusal-they will find Indian warfare,-savage modes of life-the difficulties and dangers experienced by the early pioneers in the "far, far west"-delineated with a master hand, in language glowing, vivid, and natural.-National Banner.

WACOUSTA, OR THE PROPHECY;

A TALE OF THE CANADAS. 2 vols.

This work is of a deeply interesting character, and justly lays claim to be of the highest cast. We think it decidedly superior to any production of the kind which has recently emanated from the press. It abounds with thrilling scenes, and the author has displayed a power of delineation rarely surpassed.-Daily Intelligencer.

We have read it, and unhesitatingly pronounce it one of the most deeply in. teresting works of fiction which has met our eye for many a month. It is a historical novel-the scenes of which are laid principally at Detroit and Mackina -and some of the tragic events which those places witnessed in the early settlement of the country, are given with historic accuracy-particularly the massacre of Mackina.-The author is evidently conversant with Indian stratagem and with Indian eloquence; and has presented us with specimens of both, truly characteristic of the untutored savage. We would gladly present our readers with an extract from this interesting work, did our limits permit. In lieu of an extract, however, we commend the work itself to them.-Commercial Herald.

The principal personage of this novel is a savage chief, and the story of his retreat, bearing off captive the daughter of the Governor, is told with thrilling effect. It is well written throughout, and abounds with interesting scenes.Com. Adv.

THE YOUNG LADY'S SUNDAY BOOK;

A Practical Manual of the Christian Duties of Piety, Benevolence, and Self-government. Prepared with particular reference

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