Chemistry and Physics. 259 
is in part a sequel to that of the development of fat in animals, and 
based upon facts determined during that investigation. 
The ashes of the skeleton of a pig just littered weighed 20-73 grammes, 
containing 84 per cent. phos. lime and 11 p.c. phos. mag. A hog at eight 
months, fed in the usual manner, gave 1353 grms. ; phos. lime 91:3 p. c., 
phos. mag. 3-6 p.c. A third, the same weight as the last when killed, 
was fed for ninety-three days on potatoes, and gave grams. of bone 
ashes, containing phos. lime 92°4 p.c., phos. mag. 3’8 p.c. Thus during 
assimilated in that time, and when the quantity of lime in the excre- 
ment, which was also analyzed, was taken into account, the deficienc 
was still greater. f 
The analysis of the water taken with the potatoes (the exact quantity 
used being known) showed that the deficiency of lime was suppli 
from the water, and that the two sources together had furnished no 
more lime than the hog had used. Without the water then, the animal 
would have suffered and afier a time have died. 
The author insists upon the great importance of the saline contents 
of spring water, both as furnishing the required salts to stock, and final- 
ly adding to the value of the manure. That the quantity of the salts 
is not unworthy of notice, is shown by a computation of the-inorganic 
matter taken in the drink of the cattle at Bechelhoun; in one year this 
amounts to 876 kilogrammes, about 1800 lbs. The artesian well at 
Grenelle brings to the surface in each year 59,860 kilogrammes or 
about 134,700 Ibs. of solid matter, nearly all of which is wore 
rapidly made, is destroyed in twenty four hours or less, it becoming 
changed into a deliquescent acid, as determined by Pelouze eight 
years since. lag ue 
Pyroxyline does not dissolve even in an excess of nitric acid; it re- 
mains in it for days without alteration, or even loss of weight. 
Xyloidine leaves a considerable residue of carbon when inflamed or 
detonated. pie 
: Pyroxyline leaves no residue, and comports itself very differently as 
is well known. ct 
Ayloidine may be analyzed like other organic matters by means of 
oxyd of copper, with the single precaution of augmenting a little the 
Proportion of this oxyd. 
yroxyline in the same circumstances, explodes and breaks the ves- 
sel, even when one hundredth the quantity is . 
