ON DIFFERENT KINDS OF FOOD. 
9 
It appears from this Table that there is a surplus quantity of 
370.416 grs. (13 drs. 15 grs.) of nitrogen, if ordinary blood con- 
tains 80 percent, of water, and that the dry residue (20 per cent.) 
contains 15.07 per cent, of nitrogen sufficient to form 2457.1461 
grs. of dried blood ; thus, if 15.07: 100: : 370.416 = 2457.1461, 
or 2457.1461 X 5 = 12285.7305 grs. of ordinary blood, equal to 
lib. 12oz. ldr. 8grs., so that about 1J lb. avoirdupois of blood 
may be formed daily from the above quantity of food. There- 
fore if 100 parts of dried blood contain 51.96 of carbon, 2457.1461 
will be 1276.7331 grs. of carbon. This being subtracted from 
38043.3 grs. (51b. 6oz. 15dr. 8grs.), the residual carbon in the 
Table, there remains 36766.^§§J grs. of carbon to be thrown out 
of the system by the lungs and skin in the form of carbonic acid # . 
Boussingault calculates that a horse expires daily about 4 lbs. 
avoirdupois of carbon. In reference to the salts and earthy mat- 
ters, Thaer and Edinhof obtained by ignition from 3840 grains of 
the excrements of cattle fed at the stall, chiefly on turnips, the 
following: — 
Lime ...... 12.0 
Phosphate of lime .... 12.5 
Magnesia ..... 2.0 
Iron ...... 5.0 
Alumina with some manganese . . 14.0 
Silica 52.0 
Muriate and sulphate of potash . , 1.2 
98.7 
Mr. AncelPs theory of animal heat seems to have escaped the 
notice of these two learned gentlemen. “The source of animal 
heat is in the blood itself; it results from the molecular vital actions 
of that fluid ; and the source of the higher temperature of warm- 
blooded animals is in the more energetic molecular actions con- 
tinually going on between the red corpuscles and the liquor san- 
guinis. These molecular actions are obviously most energetic in 
the lungs ; hence the relation between respiration and the heat of 
animals.” 
Mr. Ancell’s Lectures. — Lancet y Feb. 29th , 1840, p. 829. 
* There are a few discrepancies between Dr. P.’s calculations and mine, 
some of which are evidently typographic errors. 
VOL. xvi. 
B 
