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STATISTICS OF THE LIBRARY OF THE LICK OBSERVATORY.

A count, made on May 31, 1897, of the books and pamphlets in the library of the Lick Observatory, shows

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A comparison of the two counts of pamphlets is classified

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In addition to the above, I have counted 16 Smithsonian and 18 miscellaneous pamphlets, bringing the total to 3912. Photographs, drawings, maps, and charts are included in both counts.

A large number-not far from 1000, probably, of pamphlets has been selected from the drawers marked (*), and bound into volumes since the count was made in 1892. Many pamphlets are also sent, from time to time, to the General Library of the University at Berkeley. R. G. AITKEN.

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POST OFFICE AT MT. HAMILTON.

The post office at Mt. Hamilton was established in 1890, with Professor S. W. BURNHAM as postmaster. His successor was Mr. A. L. COLTON, the present incumbent. The salary of the postmaster has been a part of the pay of these officers of the observatory. The salary was, for the fiscal year ending

June 30, 1891, $301.42 June 30, 1894, $330.86

1892, 346.10

1893, 285.08

1895, 341.0I

1896, 307.69

E. S. H.

May 31, 1897.

APPOINTMENT OF PROFESSOR ROBERT G. AITKEN AS ASSISTANT ASTRONOMER IN THE LICK OBSERVATORY.

At a meeting of the Regents of the University, held May 25, 1897, Professor ROBERT G. AITKEN, B. A. (Williams College, 1887), M. A. (Williams College, 1892), was appointed Assistant Astronomer in the Lick Observatory. EDWARD S. HOLDEN.

GRADUATE STUDENTS IN ASTRONOMY AT THE LICK OBSERVATORY (1897).

The following-named gentlemen have been admitted as special students for the summer of 1897: Professor H. D. CURTIS (University of the Pacific), B. A. (Michigan, 1892), M. A. (Michigan, 1893); Professor D. A. LEHMAN (University of the Pacific), B. S. (State Normal School, Penn., 1889), Ph. B. (Wesleyan, 1893).

INSTRUMENTS MAKING IN ALLEGHENY.

The following instruments have been made recently by Mr. J. A. BRASHEAR, of Allegheny, or are at present in process of construction at his shops:

Two 16-inch photographic doublets (PETZVAL system), for Professor MAX WOLF, of the University of Heidelberg.

Eight-inch photographic doublet, with camera, for the University of Tokio. This instrument was shipped in time for use during the total eclipse of August 9, 1896, but observations were prevented by cloudy weather.

Six-inch photographic doublet for Harvard College Observatory. The focal length of the combination is forty-five inches,

and the field is fourteen degrees. According to preliminary tests, this should be a very satisfactory instrument. The star-discs are nearly round, though slightly enlarged at the extreme edge of the field.

Eight-inch visual objective, for Park College, Missouri.

Four-and-one-half-inch equatorial, complete, for the U. S. Military Academy, West Point.

Three 51⁄2-inch reflectors, equatorially mounted, for Messrs. J. M. Cook, of Macon, Georgia, J. R. BETTIS, of St. Louis, and J. O. DEVOR, of Elkhart, Indiana.

Small photographic correcting lens, for spectroscopic work with the 121⁄2-inch equatorial of the Ohio State University.

Concave grating spectroscope, complete, with many accessories, for Dr. HAUSWALDT, of Magdeburg, Germany; for a 6-inch concave grating of twenty-one feet radius.

Star spectroscope, with many accessories, including grating, photographic objectives, and camera, for the 101⁄2-inch equatorial of the University of Minnesota (Professor LEAVENWORTH). Two large star spectroscopes.

Spectrometer, with prisms and grating, for Mr. C. F. BRUSH, of Cleveland, Ohio, and various smaller pieces of apparatus.

DEATH OF ALVAN G. CLARK.

ALVAN G. CLARK, the last survivor of the famous firm of ALVAN CLARK & SONS, died in Cambridgeport on June 9, 1897, at the age of sixty-five years. The best monuments to the members of this gifted family are the splendid telescopes which they have set up during the last fifty years all over the world, from St. Petersburg to California. E. S. H.

ROYAL OBSERVATORY, GREENWICH, 1896-97.

At the annual visitation of the Royal Observatory, Greenwich, the report of the Astronomer Royal, which refers to the period from May 11, 1896, to May 10, 1897, was submitted. It stated that the building of the north wing and central dome was completed in September last. Under this dome is erected the largest telescope in the world devoted exclusively to photography-the 26-inch refractor, the gift of Sir HENRY THOMPSON. This instrument, completed in April, is already in good working order. On the same mounting is carried the 1234-inch MERZ

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