33^ 



The Journal of Heredity 



in which the carpellary areas are slight- 

 ly sunken (forma impressa of Safford) 

 and the iimhonale form with short, 

 thick, rounded protuberances (forma 

 umhonata) were both present. At 

 maturity, most of the fruits are small, 

 and many are of irregular form, just as 

 occurs with cultivated cherimoyas. 

 Large fruits are said to be produced 

 occasionally by these wild trees. One 

 which I saw weighed over a pound, and 

 specimens between three and four 

 pounds in weight are said to ha\'e been 

 found, though I do not have this on 

 very good authority. In quality, these 

 wild fruits seem to be just as good as 

 the cultivated ones produced in other 

 countries. 



It seems, therefore, that the cheri- 

 moya has undergone practically no 

 change in culti\ation. This is not 

 perhaps so remarkable as it appears at 

 first glance. When we remember that 

 most of the tropical fruits cultivated 

 in America ha\e been propagated only 

 by seed, and that they have been sub- 

 jected to \'ery little selection — indeed, 



Tuberculosis .\nd How to Combat 



It, by Francis M. Pottenger, M. D. 



C. V. Mosby Co., St. Louis. 192L 



Pp. 273. 



"\\'hen Koch discovered the tubercle 

 bacillus in 1882, he supplied the knowl- 

 edge which exploded the theory of 

 tuberculosis being an inherited disease, 

 and furnished the fundamental facts 

 which [)roved that it is an infection 

 which takes place after birth." 



The author describes the nature of 



in most cases they are not even given 

 systematic cultivation — -we can scarce- 

 ly e.\pect that the mere act of trans- 

 planting the cherimoya from P^cuador 

 to Mexico or Guatemala would pro- 

 duce notable changes in the character 

 of its fruits. 



There are many similar cases in the 

 tropics. The sapote {Calocarpum mam- 

 mosum), a common wild tree in northern 

 Guatemala, is cultivated in numer- 

 ous countries. I ha\e seen fruits pro- 

 duced in the virgin forests of Guate- 

 mala which were practically as good 

 and in no wise different from those of 

 cultivated trees in Cuba and Mexico. 

 The cashew {Anacardium occidentale), 

 as produced by wild trees on the Brazi- 

 lian coast, is fully as large a fruit and 

 not in any way different from the 

 cultivated cashews of many other 

 countries. It may be said, indeed, that 

 the majority of tropical fruits are still 

 wild species, for man has done very 

 little to improve them, except in those 

 cases such as the pineapple and the 

 banana, where the species are propa- 

 gated by suckers. 



tuberculosis, and gi\es rules for its 

 treatment which he has found of 

 value during 20 years' experience. 

 It is a book primarily for patients. 

 It is not intended to take the place 

 of a physician, but to supplement 

 his instructions. While many of the 

 rules may already be common knowl- 

 edge with thoughtful peojile, the trea- 

 tise will repay diligent reading, whether 

 or not the reader be a tubercular 

 patient. 



On Voluntary 



ClIILORIvN liV Cll.V.NtK OK BY CllOIClC, 



by William Hawley Smith. Boston, 

 Richard (;. Badger, 1920. Pp. 369. 

 This book is devoted principally to a 

 prolix demonstration of two points: 

 (1) that sex-life in the hinuan species 

 has an "affect ion;d \alue" as well as a 

 repro(lucti\e use; and (2) that it is 

 preferable that children should be born 

 as the result of deliberate planning 

 rather than "by accident." Most per- 

 sons are probabK- ready to concede 



Parenthood 



these points without argument; those 

 who are not may find Mr. Smith's dis- 

 cussion of \alue, in spite of its repeti- 

 tions and \-erbosity, although he brings 

 ff)rward no considerations that are not 

 familiar. The arginuent is not always 

 kept on a sound biological basis, and 

 when it reaches a difliciilt point the 

 author comj)letely sidesteps. This is 

 perhaps the chief defect of the book, 

 whi( h in general is written in a sensible 

 and wholesome manner.— P. P. 



