Technical Chemistry. 125 
tions, by Fresenius, and reported by him in the appendix to his treatise 
on quantitative analysis. It was found that 6°4402 grm. of mercury, 
covered with a considerable quantity of water, and heated to the boiling 
point of the latter for a quarter of an hour, lost but 0004 grm., while 
exposure to the air at summer heat for six days produced a further loss 
m 
6. Disinfectants—The use of a mixture of coal-tar and_plaster-of- 
Paris for purposes of disinfection and for dressing wounds, as pro- 
E and x (Comptes Rendus, xlix, 127; see this 
ournal, xxviii, 425), has been recently re upon in the French 
y a committee—Chevreul, J Clojuet, and Velpeau (rappor- 
eat interest, which this method,—so favorably commented upon 
—e Wounds, the powder destroyed their odor without giving rise to 
*Y special pain. Upon indolent sores, however, or upon recent burns, 
