New data in biologic and clinical lines published since the appearance of the first edition in 1929 have been incorporated in all important chapters and an entirely new chapter on anthelmintics and their use has been added. This supplemental material has added 164 pages to an already extensive work. The new chapter will greatly enhance the usefulness of the work for physicians, since it critically summarizes the existing clinical evaluations of santonin, oil of chenopodium, thymol, carbon tetrachloride, tetrachlorethylene, hexylresorcinol (caprokol), beta-naphthol, medicinal gentian violet, pelletierin, Dryopteris filix-mas, areca, kousso, pumpkin seed, kamala, quassia, coconut, antimony compounds and emetine hydrochloride. In each case the nature of the drug is given and its use, its effectiveness as an anthelmintic, dosages, administration, toxicity and uses as a specific for various helminths are reported in detail. Contraindications for each important drug are reported. Accurate diagnosis of the helminth infection is stressed and specific