148 
COTTON SEED. 
the ethereal solution, was 0.933, water being unity. 
This is also the specific gravity of purified whale-oil. 
Cotton-seed oil is stated, by Dr. Wood, to be a drying 
oil ; but that obtained by Dr. Jackson does not appear to 
possess drying properties, serving perfectly well for the 
lucubration of machinery, and for burning in lamps, as well 
as for making soap. It will also serve as a substitute for 
olive oil in many cases, and perhaps may be eaten as a 
salad oil, for it has no disagreeable odorous taste. 
Chemical Examination of Oil-Cake. — Linseed oil- 
cake is well known, both in Europe and in this country, as 
valuable food for cattle, and as an excellent fertilizer, worth 
from forty to forty-five dollars per ton for the latter pur- 
pose. On examination of the cotton-seed oil-cake, it is 
found to possess a sweet and agreeable flavor, and is much 
more pure and clean than linseed oil-cake. One hundred 
grains of the seed leave sixty grains of oil-cake. This 
cake, examined for sugar, is found to contain 1.1 grains, 
and for gum, thirty-five grains. Iodine gives no proof of 
the existence of any starch in cotton seed, nor in the oil- 
cake. Alcohol dissolves out the sugar, which is, like that 
obtained from raisins, grape-sugar. Boiling water dissolves 
the gum, and becomes very mucilaginous. The gum is 
precipitable from the water, by means of pure alcohol. 
Ultimate Analysis — Elementary Constituents of 
THE Oil-Cake. — Carbon, 37.V40; oxygen, 39.663; nitro- 
gen, 7.753 ; hydrogen, 5.869 ; salts (inorganic), 8.960. 
Total, 99.985. These salts arc obtained by the .combus- 
tion of a separate portion of the same cake. 
Chemical Composition of the Salts. — Three hundred 
grains of cotton seed burned give 16.5 grains of ashes, 
