US Patent 3,275,446 (granted 27 September 1966) describes compositions that induce silkworms to eat, for use in artificial feed without mulberry leaves. It identifies three factors that make mulberry leaves acceptable: terpenes as attractant, beta-sitosterol (with or without flavonoids) as biting stimulant, and cellulose powder as swallowing stimulant. The patent also specifies sugar, inorganic phosphate and inositol, gives test tables, two formulation examples and 11 claims.