CONTENTS. 



Descripiion of an Ins Irument for gathering Fruit, . . 162 



New Method of cultivating in Great Britain the Papaver som- 

 niferum, and nf preparing Opium from it. . . . . l64 



Memoir of the late Gaspard Monge. . . . .' . . 175 



Method of making Ivory Paper for the Use of Artists. 179 



Process for giving to Linen, Silk, Cotton, &fc, a fine Mineral 

 Yellow Colour. . . . . . . . . ..181 



An Essay on a Property in Light which hitherto has been un- 

 observed by Philosophers. .. .. .. . . 1S3 



uin Account of a Peach Tree produced from the Seed of the Al^ 



: - mond Tree; with some Observations on the Origin of the Peach 



Tree. .. .. ..199 



Address of the Astronomical Society of London : established 

 February S, 1820 201 



On the Method of extracting Iodine from Kelp. , , 207 



Present Slate of the Ruins of Babylon. .. ,. 213 



imal Remarks, by Mr. EdwaUd Riddle, on finding the Lon- 

 gitude by Lunar Observations, &c. . . . . . . 2 J 9 



Answer to Mr. Brown on Professor Jameson's System of Mi- 

 neralogy. .. .'. . . . . . . . . 241 



Further Reply to Mr. Rivdle on the Lunar Observations. 242 



Catalogue of Antient Eclipses. .. . . 244, 344, 439 



On the Expansion and Contraction of Iron Bridges by Changes 

 of Temperature ; with a Suggestion for counteracting these 

 Ejects. .. .. .. ,. :. .. 24S 



Description, of an. improved Hydro-pneumatic Apparatus. 249 



Facts respecting the increased Volatility and Inflammability 

 which Fish Oil and its Fa pours acquire by continued or re- 

 newed Exposure to certain high Temperatures. . . 252 



New Vegetable Alkalies. .. .. . . . . 289 



On the Sirene, a new Aconslic Instrument d( signed to measure 

 the Vibrations cf Air which constitute Sound 293 



Remarks to show that the Nature of the Atmosphere contradicts 

 the Notion that the Air explains the Phcenomena of the 

 Sky "295 



