A STUDY OF AN EXTREMELY PURE PREPARATION OF RICIN.

1. By following the method of Osborne, Mendel and Harris, we can obtain an extremely potent toxin from the castor bean. 2. It would appear, as a result of testing this preparation at the end of two and a half years, that the agglutinating function and the toxic function are two distinct properties. 3. This result is also borne out by the behavior under the electric current; either we are dealing with two different substances or else with a single substance with two distinct toxiphore groups, one of which is stable and the other labile.