As in previous editions, the enumerating of plant sources is complete, although many alkaloid-bearing plants have been omitted. The physiologic actions are limited, yet many pertinent references are given. Considerable space has been saved by omitting details of their estimation. The text classifies alkaloids according to the old nuclear type which was followed in preceding editions. Sections on isoquinoline and indole groups have been enlarged. The section on strychnos alkaloids has been brought down to date, although condensed. Several groups, such as lupinanes, phenanthridine, pyrrolidin and quiniazoline, have been added, while those common purine bases are deleted. The volume is indispensable and should be in every scientific library.