The seeds of the cotton plant, which are left in large quantities after the extraction of the cotton fibre, have become valuable as a source of oil, which, when clarified, is of a clear golden-yellow color. It is used as an adulterant or a substitute for linseed, sperm, lard, olive, and almond oil, for cooking in place of lard or butter, and for other purposes. A large proportion of the salad oil used in the United States is Cotton-Seed oil. The "cake," which is left after the oil is pressed from the seeds, is used as a fodder for cattle and as a fertilizer.