INDEX. 



Carbonate of magnefia, native, examina. 

 tion of, 240— Difference between it 

 and the artificial, 241 



of foda found efflorefcent on 



walls. III — Method of obtaining pure, 

 »93 



Cardan's padlock, 45 



Carlifle, Mr. on a method of clofing 

 wide-mouthed veffels, 68 



Caft iron, effects produced on it by long 

 immerfion in the fea, 70 



Cataradl of the eye, conjectures relative 

 to the caufe of, 25 



Catechu, the moft powerful of all the tan- 

 ning materials, 40 — Comparative value 

 of, 41 



Cement for extreme branch grafting, 

 128 



Charcoal cannot be abfolutely fcparated 

 from phofphorus, 133 



Chenevix, on the chemical nature of the 

 humours of the eye, 21, 93, 203 



Chimnies, defcription of a machine for 

 cleanfing, 255 



Chrouet, az 



Cinchona, on the febrifuge principle of, 

 136 — Obfervations on the varieties 

 found in the fhops, 137— Comparifon 

 between its medicinal virtues and thofe 

 of gelatine, 138— Does not contain ge- 

 latine, 225 — Experiments and obferva- 

 tions on, 226 — Contains a new prin- 

 ciple analogous to gelatine, 228 



Cinchonin, the new principle of cinchona, 

 experiments to prove the exlftence of, 

 Z2.6 — Comparifon of its properties with 

 thofe of gelatine, 228 



Clays, Cit. 252 



Clouds, efl'c^s produced by them on te- 

 lefcopic vifion, 15 



Coin, obfervations on its lofs of weight by 

 wear, 147— Difadvantage of foftnefs in, 

 148 — Lofes but little in ordinary circu- 

 lation, 15© — Comparifon of the value 

 of different alloys for, 152 — Erroneous 



opinion rcfpe£ting that of the prefcnC 



reign, i6x 

 Cold, the focal length of mirrors is Jilter- 



ed by, 16— Experimental proofs of tliis 



effeft, 18 

 Colours obtained from St. John's vfortf 



286 

 Congelation, apparatus for promoting, 21 j 

 Conte, 142 

 Corner, 72 

 Crawford, Dr. 26 

 Crocodile, effefts produced on atmofphe- 



ric air by the refpiration of, 246 

 Crofthwaite, 118 

 Cryftalline humour of the eye, chemical 



examination of, sg — Is very fubjc£t to 



diforders, 25 

 Curaudju on the Imperfections of evapo« 



rating furnaces, with a new method of 



conftrudting, 114 

 Cuthbertfon, 245 



Dalton, Mr. on a miftakc in Kirwan't 

 effay on vapour, 118 — On mixed gafes ; 

 on the force of fleam j on evaporation, 

 and on the expaufion of gafes by heat, 

 257 



Davy, Profeffor, ont he conftitucnt part* 

 of aftringent vegetables, and their ope- 

 ration in tanning, 31 



De Dominis, 56 



Delufions, audible, occafioned by debility 

 of the organs of hearing, 23X 



Dtrangements of the animal fyftem, d'rf- 

 quifitions on, 229 



Defcartes, 56 



Divacus, 73 



Donkin's table of the radii of wheels, 86 



Dree, Marquis dc, 1S8 



Dry-rot, method of fecuring timbers in- 

 jured by, t20 



Dubrec, 130 



b i Duncan, 



