A New Toxicant Occurring Naturally in Certain Samples of Plant Foodstuffs

FOR many years, residents of certain localities in South Dakota have complained that: (1) It was impossible to obtain satisfactory hatching results in chicks either by natural or artificial incubation. (2) The down on those chicks which did hatch appeared greasy, and never became fluffy. (3) Where higher hatchability was obtained, a high mortality occurred. REVIEW Stockard (1920-21) in his studies on the structural and developmental rate states: “For the past ten years I have claimed that all types of monsters not of hereditary origin are to be interpreted simply as developmental arrests.” He also states: “The lengths of time between fertilization and the first cleavage and the rates at which the early cleavage follow one another may differ decidedly among the eggs of even closely related forms. These differences in developmental rate are probably fundamentally connected with differences in chemical structure of the egg substances, and in particular with . . .