Sept. 2, 1918 
Comparative Toxicity of Cottonseed Products 
451 
Cottonseed meal exerts on pigs a harmful effect, which is not averted 
by improving the diet with efficient food materials. Such a harmful 
effect is not produced by similar feedstuffs. Hence, we conclude that 
the cottonseed-meal “injury” of swine is due, not to deficient diets, 
but to the presence of a toxic substance. In our opinion this toxic 
substance in cottonseed meal is the derivative of gossypol which we 
have called “D-gossypol.” 
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