The New Student's Reference Work (1914)
“ Neatsfoot-oil is produced by boiling the feet of cattle. Sperm-oil and other fish-oils are obtained from different varieties of fish and sea animals, as the whale, seal, cod, shark or herring. The uses of the different oils are very numerous: as food and in the preparation of food, in soap-making, painting, machinery and in a thousand other ways they are of great importance. There is a large class of substances known as the essential or volatile oils which resemble the fats somewhat in their properties, particularly in not mixing with water. ”
