Textbook of Zoology

genetic relationship between predisposition to schizophrenia and heredito-constitutional resistance to tuberculous infection." Dr. Shuttleworth doubts that the author's figures warrant this claim as they show a decline of the death rate of tuberculosis at a rate to be expected in any population. To me, the author seems to make a very bold guess when he regards it probable that the common origin of the alleged correlation between schizophrenia and tuberculosis lies in "a hereditary functional deficiency of the reticulo-endothelial system." Concerning eugenic recommendations Dr. Kallmann is rather conservative. He advocates enlightenment of schizophrenic patients and their families concerning the undesirability of propagation. Only in a minor number of cases does he consider legal intervention as to permanent institutionalization, prohibition of marriage, and voluntary sterilization necessary. "Compulsive sterilization could then be confined to absolutely incorrigible schizophrenics who do not need hospitalization and who may be expected to propagate themselves even out of wedlock and against medical advice." Some of the author's conclusions are very suggestive, but the most important ones, especially the supposition that schizophrenia is inherited according to a single recessive Mendelian mode, do not appear perfectly fireproof as he, of course, fully realizes. There is no doubt, however, that he has worked up his material with admirable thoroughness. Apparently material of this type will not permit anyone with the methods applied to come to unquestionable results as to the genetics of schizophrenia. A great number of completely worked up twin cases might help a great deal. This book is something new in the field of biological texts in the broad-ness of its scope and the arrangement of subject matter. Besides the orthodox treatment of the Animal Phyla, which is done very well, there are separate and Wild Life Conservation are especially good. On the whole, the treatment of Invertebrates is better than is that of Vertebrates. The consideration given to Protochordates is better than in most texts, and is well chosen. The chapter on Genetics and Eugenics gives an unusual amount of attention to human heredity. Few errors or omissions occur; in the chapter on Mammals consideration of the order fails to make any mention of the Sirenia. An inevitable result of the attempt to cover so broad a field is that the text, despite its 900 pages, gives too brief attention to much of its material;