144 The Journal of Heredity 



Table 9. Comparison of clergymen of parental group with the number of their surviving 



children 23 years of age. 



Number of married ministerial graduates plus their wives Ii8 



Number of second wives 3 



Number of single ministerial graduates 2 



Total 123 



Number of minister's children, living and dead 2i6 



Computed surviving children, age 23 167 



Table 10. Comparison of sice of parental group iti ivhich the zvives are at least 45 years 

 of age, with the number of surviving children 20-24 years old. 



Number of married men graduates, plus their wives, some of whom are graduates.... 352 



Number of second wives of men graduates 7 



Number of single men graduates ■ 25 



Number of married women graduates (45 years old or older, or deceased), plus their 



husbands; women who married men graduates are omitted 48 



Number of single women graduates 28 



Parental group, total 460 



Number of men graduates' children, living and dead, (includes all children, both of 



whose parents were graduates) 493 



Number of women graduates' children, living and dead 49 



Total children 542 



Computed surviving children, age 20 yeai s 426 



Computed surviving children, age 21 years 424 



Computed surviving children, age 22 years 422 



Computed surviving children, age 23 years 420 



Computed surviving children, age 24 years 418 



A Handbook for Tropical Plant Breeders 



Handbuch der Landwirthschaft- Freeman (cotton). While most of the 



LiCHE Pflanzenzuechtung, by C. important colonial products are given 



Fruwirth. Band V., Die Zeucht- attention, one notes some strange 



ung kolonialer Gewaechse. Zweite. omissions, as for instance, the banana 



gaenzlich neubearbeitete Auflage. and the pineapple. The date palm is 



Pp. 272. Price, $2.00. Berlin, Ver- dismissed with a perfunctory single 



lagsbuchhandlung Paul Parey, 1923. page. The volume lacks an index. 



The first edition (1912) of Dr. Fru- ^ut despite some imperfections, the 



wirth's unique and almost indispen- book stands alone as a cornpilation of 



sible work has been out of print for the most iiseful data on the breedmg 



nine years; only the war and the sub- ^^ ?,"'^ °/ ^Y^ principal crops of the 



sequent difhcuUv of getting together ^^r d. Much of the most important 



a new set of collaborators have caused work m plant breeding during the 



this delay in its reappearance. The "^xt few generations is likely to be 



present book is rewritten and brought ^'o"^ in the hitherto largely untouched 



up to date by experts from all parts field of tropical crops, and Dr. Fru- 



of the world: American collaborators wirth's handbook will probably be the 



are H. J. Webber (citrus fruits), O. starting point for most of the breed- 



E. White (castor bean), and G. F. ers. — P. P. 



