Chemotherapeutic Researches on Cancer. A Review *"Chemotherapeutic Researches on Cancer," by A. T. Todd. M.D., M.R.C.P., Bristol; J. W. Arrowsmith Ltd., 1928. Pp. 127, Price 2s. 6d.

this should be so, for the exact knowledge of the relation of a malignant growth to the organism bearing it is still lacking. 1 he chorionic hypothesis of Beard and Blair Bell of the nature of cancer is far from satisfactory. The invasive and destructive appearances in the deciduate placenta? of rodents and primates is clearly much more due to the peculiar reaction of the maternal tissues in these orders than to primary properties ?f chorion (or trophoblast) as such. This may be inferred from the complete absence of these features in the non-deciduate Placentae (e.g. in the sheep), in which the villi dip into the uterine glands without entering into organic union with the maternal tissues. The conclusion is slowly gaining in cogency that the abortifacient action of lead as well as the ameliorations