THE HE Authors of Original Papers and Communications in the present Volume are Mrs. Agnes Ibbetson; J. D. Maycock, Esq.; Mr. G. J. Singer; Mr. E. Lydiatt; Mr. John Davy; W. Crane, Esq. F. R. M. S. Ed.; Mr. R. Lyall, M. R. P. S. E. &c.; R. L. Edgeworth, Esq. F. R. S. M. R. I. A.; L. O. C.; T. A. Knight, Esq. F. R. S. &c.; Mr. J. Dalton; the Rev. J. Blanchard; J. Clarke, M. D.; Mr. J. T. Price; Mr. St. Amand; T. Forster, Esq.; Mr. J. Murray; Marshall Hall, Esq.; W. Moore, Esq.; Mathematicus; Mr. B. Cook; W. N.; Zeno. Of Foreign Works, Messrs. Gay-Lussac and Thenard; M. Regnier; M. Van Meerten; M. Stratingh; M. Cagniard Latour; M. de la Chabeaussiere; Mr.G. B. Sage; M. Bucholz; M.Daubuisson; M. Cordier; Dr. B. H. Tarry; M. C. Duméril; M. L. Cordier; M. Hassenfratz. And of British Memoirs abridged or extracted, T. Thomson, M. D. F. R. S. E, &c.; the Rev. J. Bremner; T. A. Knight, Esq. F. R. S. &c.; H. Davy, Esq. LL. D. Sec. R. S. Prof. Chem. R. I. F. R. S. E.; Mr. E. Smith; Mr. J. Hutton, junr.; H. P. Lee, Esq.; the Rev. J. Hall; Mr. T. Balls; Mr. J. Baker; Mr. W. Jeffery; Mr. J. Davis; Mr. W. Moult; Mr. B. Smith; Mr. J. Taylor; B. C. Brodie, Esq. F. R. S. The Engravings consist of 1. Dissections of Plants, illustrating the Growth of the Bud, by Mrs. A. Ibbetson. 2. Crystals of Allanite, by Dr. T. Thompson. 3. Instruments for measuring the Velocity of Rivers, by Mr. Regnier. 4. Method of covering a Roof with Flagstones, by R. L. Edgeworth, Esq. F. R. S. M. R. I. A. 5. A Ship's ordinary Boats converted into Lifeboats, by the Rev. J. Bremner. 6. A Barometer with an adjusting Scale, and 7. An Airpump for producing a perfect Vacuum, by a Correspondent. 8. Section of a Grapehouse, by T. A. Knight, Esq. F. R. L, and H. SS. 9. Figures to illustrate the Formation of the Leaves of Firs, and their Fructification, and the Motion of the Flower of the Barberry; delineated by Mrs. Agnes Ibbetson. 10. A Diagram illustrating the Radiation of Cold, by Marshall Hall, Esq. 11. Diagrams illustrative of the Motion of Rockets, by W. Moore, Esq. 12. A new Thrashing Machine, invented by H. P. Lee, Esq. 13. A Screw adjusting Plough, by Mr. Thomas Balls. 14. An improved Implement for extirpating Docks and Thistles, by Mr. J. Baker. 15. A pair of expanding Harrows, by Mr. Wm. Jeffery. 16. Mr. J. Davis's Fire-escape. 17. Mr. W. Moult's Filtering Apparatus. 18. Mr. B. Smith's Method of Relieving a Horfe, that has fallen in the Shafts of a loaded Cart. 19. Mr. J. Taylor's Extractor of foul Air from Mines, &c. TABLE TABLE OF CONTENTS Engravings of the following Subjects: 1. Dissections of Plants, illustrating the Growth of the Bud, by Mrs. A. Ibbetson. 2. Crystals of Allanite, by Dr, T. Thompson. 3. Instruments for measuring the Velocity of Rivers, by Mr. II. Observations on the Hypothesis, which refers chemical Affinity to the elec- 12 III. Observations on the igniting, or Wire-melting Power of the Voltaic Bat- tery, as proportioned to the Number of Plates employed; with an Account of some Experiments on this Subject, made in Conjunction with Mr. John Cuthbertson; by Mr. John Singer, Lecturer on Chemistry and Natural Phi- VIII. Experiments on Allanite, a new Mineral from Greenland; by Thomas Thomson, M. D. F. R, S. E. Fellow of the Imperial Chirurgo-Medical X. Observations respecting the Sensible Perspiration of the Dictamnus Albus, or Fraxinella: by Mr. Robert Lyall, Surgeon, M. R. P. S. E., &c. com- Engravings of the following Subjects: 1. Method of covering a Roof Flagstones, by R. L. Edgeworth, Esq. F. R. S. M. R. I. A. _ 2. A ordinary Boats converted unto Lifeboats, by the Rev. J. Bremner, Barometer with an adjusting Scale, and 4. An Airpump for producing a perfect Vacuum, by a Correspondent. 5. Sections of a Grapehouse, by T. A. Knight, Esq. F. R. L. and H. SS. I. Description of a Method of Roofing Buildings securely with Flagstones. By II. Method of making any Ship's Boa a Lifeboat, to preserve the Lives of the Crew in imminent danger; by the Rev. James Bremner, Minister of Walls III. On the Scale of the Barometer, and the Construction of an Airpump for procuring a perfect Vacuum. In a Letter from a Correspondent 105, IV. A Description of a Forcing House for Grapes; with Observations on the best Method of constructing them for other Fruits. By T. A. Knight, Esq. V. On some of the Combinations of Oximuriatic Gas and Oxigen, and of the Chemical Relations of these Principles to Inflammable Bodies. By Hum phrey Davy, Esq. I.L. D. Sec. R. S. Prof. Chem. R. I. F. R. S. E. 112 VI. Farther Account of a Mule Animal between the Male Ass and Female Ze- bra. In a Letter from Thomas Andrew Knight, Esq. F. R. S. &c. VII. Remarks on Potassium, Sodium, &c.; in Reply to the Communications VIII. Table of the Rain that fell in various Places in the Year 1810, by the Rev. J. Blanchard, of Nottingham; with a Meteorological Table for the |