Photograph of box of Snarol, Antrol Laboratories Incorporated, Southern California, 1931. "For Your Convenience, [ilg] Accept No Substitute for Snarol; The contents of this package will cover 350 square feet for one application; Net Weight 4 Pounds; Important, Note these four advantages of Snarol; 1. Will not harm vegetation when used according to directions, 2. Easy to use. Requires no preparation, 3. More economical because it lasts longer, 4. A scientific, proved and guaranteed product, Manufactured & Guaranteed by Antrol Laboratories Inc., Los Angeles, California; Snarol, Trade Mark Registered U.S. Patent Office, Quickly Kills, Cutworms, Snails, Slugs, Sowbugs, Earwigs, Grasshoppers, A ready prepared bait meal that is sure, Economical and easy to use; Poison; Composition, Active ingredient, Tricalcium Arsenate: 4.00%, Insert Ingredients: 96.00%, 100%; Total Arsenic in terms of Metallic Arsenic, Arsenic in Water soluble form, in terms of Metallic Arsenic: 0.25%; Antidote: Emetic of mustard, hydrated oxide of iron and magnesia and a cupful, follow with olive oil or whites of eggs, mucilaginous drink; thirty grains potassium bromide in water; or give paregoric, two tablespoonfuls in water if much pain" -- on box