190 



The Journal of Heredity 



contrasted species of the section Brug- 

 mansia, or tree daturas: Datura arborea, 

 D. suaveolens, D. saniiuinea, and D. 

 rosei. Figure 16 shows fruits of phmts 

 belonging to the same section: No. 1 

 of the typical form of D. arborea, with 

 entire leaves collected by Mr. O. F. 

 Cook in the Andes of Peru; No. 2, of 

 a second form of the same species with 

 remotely toothed leaves and somewhat 

 larger tiowers; No. 3, of Datura san- 

 guinea with narrow entire leaves and 

 glabrous red flowers; and No. 4, of D. 



rosei a closely allied species with sinuate 

 or lobed velvet lea\'es, and pubescent 

 saffron-colored flowers with lomentose 

 peduncles. 



Tree daturas are usualK' propagated 

 by means of cuttings. It is quite 

 possible, however, to obtain seeds of 

 most of them in their natural habitats, 

 and by crossing their progeny developed 

 varieties rivaling the hybrid Cannas, 

 Begonias and other beautiful creations 

 of recent^years. 



EDUCATION AND THE SIZE OF 

 FAMILIES 



Worcester, Mass. 

 The Editor, 



Journal of Heredity, 

 Washington, D.C. 

 Dear Sir: 



There have been a number of 

 investigations as to the size of families 

 of college graduates, compared to 

 nongraduates, the universal conclusion 

 being that the college graduates do not 

 produce enough children to maintain 

 their numbers. Further figures show 

 that the graduates of women's colleges 

 produce but little jnore than half as 

 many children as those from co- 

 educational colleges, largely because a 

 smaller proportion of the former marry. 

 These facts are well enough established 

 so that it is not necessary to quote 

 figures, but the interpretation of these 

 figures is a subject that badly needs 

 study. 



Some investigators look at the small 

 number of children in the families of 

 the women graduates, and jump to the 

 conclusion that they have located the 

 trouble, but the records of women in 

 the same class of society, who do not 

 attend college, show a similar condi- 

 tion. There may be a fault here — therj 

 very likely is — but for the principal 

 causes we must look further. 



FAMILIES OF SCIENTIFIC MEN 



Cattell, in the Scientific Monthly, 

 Vol. 4, page 248. has given sonu 



interestiVig data on this subject in an 

 article about the families of scientific 

 men. This data is especially valuable 

 as it was collected without any refer- 

 ence to the theory that I am support- 

 ing. He shows that while early 

 marriages, in general, produce larger 

 families, in the case of scientific men 

 those who marry between the ages of 

 25 and 30 have t'le largest families. He 

 further shows that the educated wife 

 of a scientific man has nearly if not 

 quite as large a family as the un- 

 educated wife. 



These two facts have received but 

 little consideration, but are extremely 

 significant. Further investigation 

 should be undertaken in other groups 

 of society along similar lines, such as 

 among the doctors, ministers, laborers, 

 etc. It would also be interesting to see 

 if the same results are to be found 

 among the unsuccessful scientific men, 

 for Cattell only considered the success- 

 ful ones. Possibly the relationship of 

 early marriage and large families is not 

 one of cause and efi'ect, but is only a 

 common characteristic of the same 

 classes in society, and that if we could 

 postpone the marriage of the feeble 

 minded they would have even larger 

 families. But this does not seem 

 probable. It is more likely that this 

 is confined to certain classes. To 

 which classes is it confined and for what 

 causes? 



