No. 2, June, 1921] GENETICS 159 



between the English-speaking and the German peoples and will be determined by the con- 

 servation of the superior stock in the racial heritage. "The deeper current of human affairs 

 knows nothing of the ripples which so constantly fill our excited vision; it runs silently past 

 the hours of the day to meet the centuries, carrying the racially strong through all accidents 

 of war and peace to ultimate world domination." To meet this situation and to counteract 

 the natural tendencies of civilization, Humphreys conceives a nation-wide conscription and 

 registration of all defectives, the segregation of the incompetent in "farm community 

 centres," and the enforced sterilization of "border-liners." But the cutting off of thedefec- 

 tive germ-plasm is not sufficient. The infertility of the superior stock would still lead to 

 the dead level of a mediocre race. To meet the need of propagating from the superior breed, 

 a "new motherhood" is conceived. By scientific methods it is considered "possible to gain 

 a distinguished father for one's children as impersonally as one would take inspiration from 

 his books," and thereby the superior celibate womanhood of the race becomes the preserver 

 of the "great inheritance of mankind." — Howard J. Banker. 



1095. Klebahn, H. Impfversuche mit Pfropfbastarden. [Infection experiments with 

 graft hybrids.] Flora 11/12: 418-430. 1918. — Tomato is readily susceptible to disease caused 

 by Septoria lycopersici and Cladosporium fulvum. The black nightshade, Solarium nigrum, 

 is resistant to both of these. In this investigation an effort was made to determine the 

 resistance of various graft hybrids of tomato with the black nightshade to these fungi. — 

 Results of infection experiments on the following chimeras, using Septoria lycopersici, are 

 given: Solanum tubingense — the outer epidermis is tomato tissue while all the inner tissues 

 are black nightshade. Plant is resistant. Solanum proteus — 2 outer layers of cells are tomato 

 tissue. Considerable infection was obtained. Solanum Koelreuterianum — epidermis, night- 

 shade; interior, tomato tissue. Infection was obtained. Solanum Gaertnerianum — 2 outer 

 layers, nightshade; interior, tomato. Both positive and negative results were obtained 

 with infection trials. Solanum Darwinianum — epidermis, nightshade; center, nightshade; 

 an intervening area, tomato. Infection was obtained. Experiments with Cladosporium 

 fulvum were unsatisfactory and will be repeated. — C. L. Porter. 



1096. Kniep, H. [German rev. of: Collins, E. J. Sex segregation in the Bryophyta. 

 Jour. Genetics 8: 139-146. PL 6, 5 fig. June, 1919 (see Bot. Absts. 3, Entry 2103; 5, Entry 

 1635).] Zeitschr. Bot. 12 : 685-686. 1920. 



1097. Lenz. [German rev. of: Noorden, C. von, tjnd S. Kaminer. Krankheiten und 

 Ehe. Darstellung der Beziehungen zwischen Gesundheitsstorungen und Ehegemeinschaft 

 (Diseases and wedlock. The relation between ill health and marriage.) 1111 p. Thieme: 

 Leipzig, 1916.] Arch. Rass.- u. Gesellschaftsbiol. 13:208-221. 1918. 



1098. Lenz, Fritz. Oskar Hertwigs Angriflf gegen den "Darwinismus" und die Rassen- 

 hygiene. [Oskar Hertwig's attack on Darwinism and race hygiene.] Arch. Rassen- u. Ge- 

 sellschaftsbiol. 13 : 194-203. 1920. — This is a criticism of Hertwig's whole attitude towards 

 Darwinism and race hygiene, and is directed in particular at his recent pamphlet, "Zur 

 Abwehr des ethischen, des sozialen, des politischen Darwinismus" (Jena, 1918). It is claimed 

 that Hertwig has misconstrued both Darwinism and Lamarckism, and that he has drawn a 

 caricature of race hygiene and the selection theory. His own theory, — a form of deter- 

 minism depending on a structure and organization of matter by virtue of some inherent 

 "force," — is held to be philosophically untenable and smacking of the materialistic meta- 

 physics of the 19th century. In the field of ethics, moral value is, according to Hertwig, the 

 directing force; but Lenz maintains with Kant and other philosophers that moral force is 

 outside the world of experience, and that a natural theory which has for its object the laws 

 of "being and becoming," has no application to the principles of values, nor, therefore, of 

 ethics. — L. J. Cole. 



1099. LiPscHxJTZ, A. Bemerkung zur Arbeit von Knud Sand iiber experimentellen Her- 

 maphroditismus. [Comment on the work of Knud Sand on experimental hermaphroditism.] 



