442 INDEX. 



Cinchonine, process for obtaining, 325 



Ciphers, for secret writing, remarks on, 21 — on Mr. Chenevix's, 

 22-24, 28— Lord Bacon's, 24, 25— Mr. Blair's, 25-27 — spe- 

 cimens of some ciphers by the Rev. Edward Hincks, 29 



Clock, the daily rate and error of, at one time of the day, being 

 known, a table to find its corresponding error throughout the 

 day, 155-166 



Clock-dial of the Tron Church at Glasgow, account of the illu- 

 mination of, by gas, 229-231 



Coal-gas, successfully applied to the inflation of balloons, 

 114,1151 



Coindet (Dr. Z.), on the use of iodine in medicine, 187-189 — 

 particularly in scrofula, 243-245 



Colchester, description of an ancient sphinx found at, 1-17 



Com6ma<('on (chemical), principles of, 306-311 



Combtistibles, experiments on the mechanical action of, 31 1-313 



Combustion of ether, products of, 64-74 



Comets, on determining the equations of, 137-149 — correction 

 of the elements of an orbit of, that has been determined, 

 149-151 



Compass-needle, best kind of steel and form for, 1 32 



Copper, analysis of ferro-arsenical sulphuret of, from Freiberg, 

 30-32 — of an antimonial sulphuret of copper from Kapnik, 

 32, 33, 34 — of a cupreous sulphuret of lead and antimony, 

 from Clausthal in the Hartz, 34, 35, 36 — of the sulphuret of 

 copper and bismuth, 36, 37 — effects of copper on vegetation, 

 178 — of a copper pyrites, 330 — account of the native 

 copper mines on Lake Superior, 422 



Correspondence (secret), easy method of, 292, 293 



Cumaneana, notice of an earthquake at, 426 



Cunobelin, a British '^monarch, remarks on some coins of, 6-8, 



12, 13 

 Cyanogen, on the combination of oxides with, 175-177 



Dalton (Mr.) observations of on the solution of carbonate of 

 lime, 408, 409 



Daniell (J. F. Esq.) inquiry (with experiments) into the nature of 

 the products of the slow combustion of ether, 64-74 — meteo- 

 rological observations by, for one year, 97-111 — comparative 

 remarks (with three tables) on the weather and seasons of the 

 years 1819-20 and 1820-21, 111-114— illustrative remarks 

 on Mr. Green's aerial voyage, 117-118 



Davy (Sir Humphry) observations of on the magnetic pheno- 

 mena produced by electricity, 126 — his discourse on awarding 

 Sir Godfrey Copley's prize medals, 300-304 — his chloridic 

 theory reluctantly acknowledged by foreign chemists, 306- 

 307 — notice of his observations and experiments on the papyri 



