Physiological Chemistry. 271 
much of this acid is oxydized as to form sulphate of iron sufficient to 
convert the eH part of the sea-salt into sulphate . soda and chlo- 
rine gas, which is thus produced in the second of the heating. 
harging a series - furnaces with this mixture, - eeuiae together 
the chlorine from one and the sulphurous acid from another in the 
eou 
previous paper in the Canadian Naturalist for 1862 (page 194), Mr. Mac- 
farlane has detailed numerous experiments made with reference to this 
transformation into sulphate of soda and chlorine of a mixture of pe 
-salt in presence of a large excess of peroxyd of iron. The u 
Sapp CHEMISTRY 
n the exoretion of Nitrogen in animals.—The experiments of 
tim and Reiset, as well as those of Boussingault, have conducted 
that of the food. In such a case a airinial se counniadialy lose flesh. 
In order to silence ‘all cavil aed to establish so important a law on 
an irrefutable pencil Voit (Ann. Chem. u. Ph., ii, Sop. -» Pp. 238) has 
hcreted whould be found equal to the ingested nitrogen, any. loss of 
nitrogen by exhalation would result in the wasting away and final death 
of the animal. 
Voit fed a pigeon 124 days (from Oct. 5, a to February 6, eee 
exclusively with peas, The bird consumed 3642°8 grm. air-dry =3132 
ox ac (at 100° C.) peas, which contained om 7 per cent —149°4 bt 
iioas The excrements dried at 100° C, weighed 976 grm. and 
the mean result -of 12 siatyonn 14:95 per cent =145°9 
grm. of shvoget or 3°5 grm. less than was in the food. The pigeon had 
* Die Gesetze der Ernahrung des Fleischfressers durch neue Untersuchungen fest- 
gestellt. Leipzig and Heidelberg, 1860. 
