W. Gibbs—Contributions to Chemistry. 207 
Art. XX.—Contributions to Chemistry from the Laboratory of the 
Lawrence Scientific School, No. 3; by Woucorr Gisss, M.D., 
Rumford Professor in Harvard University. 
§ 1. On a new general method of volumetric analysis. 
IN a memoir on the quantitative determination of nitric acid, 
H. Rose* mnenesiee that in particular cases the metal in the ni- 
with a drop 
of a saturated solution of sulphydric acid in water, or with any 
other reagent which may be specially adapted to the metal in 
the salt examined. The precipitation being complete the liquid 
18 Ulte the washin 
allowed to flow into a half liter or liter measure, and the wash- 
cool and the volume made up to exactly a half liter or liter by 
the addition of water. After thoroughly mixing the contents of 
ed simply as a guide. T'wo or more successive portions of the 
acid liquid may then be taken out and determin successively, 
and the mean of several determinations obtained. With ver, 
little practice the results will be found to correspond to y's ¢ ©. 
When a burette with Erdmann’s swimmer is employed. Ps 
the quantity of ammonia required to neutralize at 
cat of acid, and in many cases also of base, in the sat may 
ily calculated. : eh 
" # Pogg. Amn, B. cxvi, p. 125, 
