1. Baptisia perfoliata (L.) R. Br., has been found to contain at least six alkaloids, four of which, i. e., d-sparteine, cytisine, N-methylcytisine and anagyrine are known. 2. The fifth alkaloid, present as a trace, appears identical with alkaloid P2, also present in small quantity in B. australis. 3. Baptifoline, the remaining base, seems to be new. © 1948, American Chemical Society. All rights reserved.