CONTENTS. 



XI.I. Proceeding'! of Learned Societies §fl 



XL1 f. Intelligence and Miscellaneous Articles 27S* 



')s.L\U. Extract from a Memoir entitled *' Consideration.? 

 on Colours, and several nf their singular ylppcarauces." 

 Jkcid in the Mathematical and Physical Clu'is of the 

 French National Institute, Fentose 1-f, ^In 13. Bif 

 C. A. Prieur 2^ 



XLIV. On the Variations of the Terrestrial Magnetism 

 in different Latitudes. By Messrs. Humbol]>t and 

 BioT. Read by M. Biot in the Mathematical and 



' Vhysical Class of the French National Institute 26th 

 Frimaire, An 13. {Mfh December 1804.) 293 



XIA\ Cmcerning the Stale in -which the true Sap of 

 Trees is deposited during Winter. In a Letter front 

 Thomas Andrew Knight, Esq. to the Right Hon. 

 Sir Joseph Banks, Burt. K.B. P.R.S 30g 



XLVI. Description of the Coming-up Glass Telescope, as 

 made by Mr. Thomas Jones, Mathematical, Optical^ 

 and Philosophical Instrument Maker ) Pupil (f the late 

 Mr. Ramsden 319 



XLVII. On the Buds and Ramifications of Plants; the 

 Birth of these Organs, and the organic Relation between 

 the Trunk atid the Branches : in a Letter from G. L. 

 KoELER, M. D. Professor of Botany and the Materia 

 Medica in the Provisional School of Medicine at Mcntz, 

 to M. Ventenat, Member of the French National Iw- 

 stitute ." 321 



XLVIII. Progress of Fciccination in India 327 



XLIX. Memoir on a neiv Genvs of Mammalia called Hy- 

 dromis. By E. Geofproi (Saint-Bilairk) .... 328 



L. Physico-mechanical Experiments and Discusvons of the 

 Phcenomena observable in that carnal Product of Art the 

 Hand Granade, Prince Rupert's Drop, or Glass Tear^ 

 By Mr. John Snart, Optician 334 



LI. Twenty-third Communication from Dr. Thornt-oj*t 



339" 



l.II. A simple 'Method of making Tubes of Elastic Gum or 

 Caoutchouc, to avoid the Expense cf Solution in JEiher 



34 Ci 



LIT I. Notices raped ing New Books 34(y 



LI^^ Proceedings of Learned Societies 353 



IX. IntcUigf) ce and Miscellaneous Articles 2i(y^ 



TI^E 



