CHAPTER IX. 
COTTON SEED-CHEMICAL COMPOSITION— UTILITY OF SUEPLTTS 
SEED— FOOD FOB CATTLE— MANURE— OIL— OIL-OAKES. 
Pkof. Jackson lias made several analyses of cotton 
seed, whicli, together with his remarks suggested by his 
examination, we here present for the benefit of the reader. 
His first analysis was made for the purpose of determin- 
ing the proportion of fixed oil contained in the seed ; the 
next was a chemical examination of the properties and 
composition of the " oil-cake," or what remains of the seed 
after the extraction of the oil. The third gives the true 
elementary constitution of the oil-cake ; and the fourth, the 
nature and proportions of the inorganic principles, or 
mineral salts, contained in the ashes of the incinerated oil- 
cake, and also, that of the seed before the oil was separated. 
It will be understood by the chemist that a vast deal of 
labor has been required to work out all these results. 
Separation of the Oil. — In order to separate the 
fixed oil, pure ether was employed, and it was found that 
one hundred grains of the dried pulverized seeds yielded, 
in one experiment, 39.Y, and in another 40 per cent, of 
pure fatty oil. By pressure, 33 per cent, of oil was 
obtained. The specific gravity of the oil obtained from 
