“ In the vegetable kingdom fats especially occur in the seeds and fruits, and sometimes in the roots. Physiological subjects concerned with the part played by fats in living animals are treated in the articles Connective Tissues; Nutrition; Corpulence; Metabolic Diseases. The fats are chemically similar to the fixed oils, from which they are roughly distinguished by being solids and not liquids (see Oils) . While all fats have received industrial applications, foremost importance must be accorded to the fats of the domestic animals—the sheep, cow, ox and calf. ”