318 Chittenden and W hitehouse—Metallic 
mined by ignition in a combustion tube with quick lime, with a pos- 
terior layer of calcium carbonate and sodium bicarbonate.* 
The mercury distilled, was collected in water and after thorough 
washing with alcohol to remove hydrocarbons, etc., was dried and 
weighed. 
Following are the results of our analyses of the several prepara- 
tions made. 
No. Amt. Sub. taken. Wt. Hg. Per cent. Hg. 
la 0-8050 gram. 0:0226 gram. 2°80 
b 0°8732 0°0274 3°13 
2a 0°7637 00215 2°82 
b 0°7357 00201 2°73 
3a 05088 00150 2°96 
b 0°6261 0:0167 2°66 
4a 0°9152 00300 3°28 
b 08503 0:0270 317 
5a 08492 0°0218 2°56 
b 0°8610 00237 2°75 
6a 09674 0-0284 2°98 
The average content of mercury is 2°89 per cent. The theoretical 
amount for (C,,H,,,N,.SO,,),+ Hg—H, is 3:00 per cent. 
(g) Silver compounds. 
Silver nitrate is a well known precipitant of albumin, and Lieber- 
kiihn,t many years ago, assigned to silver albuminate a definite 
formula, calling for 6°67 per cent. of silver oxide. The preparation 
made by him from egg-albumin was found to contain 6°55 per cent. 
of silver oxide = to 6°27 per cent. of Ag. Mulder,t likewise, work- 
ing with alkali-albuminate, found that by neutralizing the solution 
as nearly as possible with acetic acid, and then precipitating with 
silver nitrate, the silver albuminate so prepared contained 6°14 per 
cent. of silver oxide. 
Fuchs, using ordinary egg-albumin instead of alkali-albuminate, 
found only half as much silver (3°28 per cent. Ag), while O. Loew,]|} 
working with purified egg-albumin, found still smaller percentages 
of silver in the albuminate made by him. Using an albumin 
* See Fresenius, Quantitative Chemical Analysis. 
+ Poggendorfi’s Annalen, 1852, vol. clxii, p. 123. 
{ See Berzelius’ Lehrbuch der Chemie, vol. ix, p. 49. 
§ Annalen d. chem. u. Pharm., Band cli, p. 372. 
|| Piliger’s Archiy fir Physiologie, Band xxxi, p. 393; Ueber Hiweiss und Pepton, 
