No. 1, August, 1921] GENETICS 41 



257. Matthaei, R. [German rev. of: Stpunacii, E. Verjiingung durch experimentelle 

 Neubelebung der alternden Pubertats-Driise. (Rejuvenation through experimental revitali- 

 zation of the senile sex glands.) Arch. Entwicklungsmech. 46: 557-019. 9 pL, 7 fig. 1920.] 

 Zeitschr. Allg. Physiol. 19: 50-52. 1921. [See also Bot. Absts. 9, Entry 238.] 



258. Matthaei, R. [German rev. of: DOrken, Bernard. Versuche iiber die Erb- 

 lichkeit des in farbigem Lichte erworbenen Farbenkleides der Puppen von Pieris brassicae. 

 (Studies on the inheritance of the coloration induced in the pupae of Pieris brassicae by colored 

 light.) Nachrichten K. Ges. Wiss. Gottingen 1919.] Zeitschr. Allg. Physiol. 19: 49-50. 1921. 



259. MiLOJEVic, BoRivoJE Dim. Sur le protoplasma generatif chez Gregarina cuneata. 

 [On the generative protoplasm of Gregarina cuneata.] Compt. Rend. Soc. Biol. 84: 99-100. 

 1921. — Encysted Gregarina cuneata normally possess 2 nuclei, the behavior of which the 

 author follows through the sexual cycle. Karyosomes lose their staining capacity and the 

 nuclei increase in size. Around the nuclei is formed a hyaline and a verj' dense area which 

 the author interprets as generative protoplasm. Hyaline area is formed by the fusion of 

 the walls of cytoplasmic alveoli, the latter disappearing; this begins near wall of primary 

 nuclei and extends outward. As the above appears the nuclei disintegrate and, in connec- 

 tion with the karyosome, the primary generative nucleus appears. This nucleus leaves the 

 karyosome (the remains) and passes into the hyaline area. It is only there that it divides 

 and gives rise by way of mitosis to all the other generative nuclei, the future nuclei of the 

 gametes. This hyaline area, crammed with little vesicular nuclei, becomes peripheral 

 in the cyst. The author thinks cytoplasm plays role in heredity because differentiated at 

 the same time as generative nucleus. — C. L. Parmenter. 



260. Moss6ri, V. M. Note sur la purification et 1 'amelioration des cotons egyptiens. 

 [Purification and improvement of Egyptian cottons.] Bull. Agric. Algerie-Tunisie-Maroo. 

 Ser. II, 27: 6-10. 1921. — Causes of deterioration of Egyptian cotton are discussed and a 

 plan outlined for improvement by selection. — T. H. Kearney. 



261. Nilsson-Ehle, H. Multiple allelomorphe und Komplexmutationen belm Weizen. 

 (XJntersuchungen iiber Speltoidmutationen behn Weizen II.) [Multiple allelomorphism and 

 complex mutations in wheat (studies on speltoid mutations in wheat II). Hereditas 1: 277- 

 311. 1920. — Several multiple allelomorphs in wheat are discussed, (a) Glume characters, — 

 pubescent, half-pubescent, and glabrous. Pubescence is dominant over half-pubescence 

 and glabrousness, and half-pubescence over glabrousness, with F2 segregating 3:1 in each case, 

 (b) Spike characters, — beardless, half-bearded, and bearded. The last 2 types originated from 

 the 1st through complex mutation and linkage. Beardlessness is dominant over the other 

 2, and half-bearded over bearded; segregation, 3:1 in Fj. (c) Speltoid mutations, — normal 

 type, beardless speltoid, and bearded speltoid. This multiple allelomorphism is brought 

 about by complex mutation, i.e., a simultaneous mutative change in several Mendelian genes, 

 being true mutations in fact. The bearded speltoid arises through complex mutation from 

 the normal type, but the genes in question are closely linked, and therefore the possible re- 

 combinations, — the bearded normal and beardless speltoid, — seldom appear in the progeny of 

 heterozygotes. A dense eared suh-compacttmi type arises in such progeny somewhat more 

 frequently. Compa^him factor is interpreted as less closely linked to other mutated 

 factors. At least 3 genes are assumed to mutate at the same time. The author adds a theo- 

 retical discussion of nature of complex mutations and their relationships to pleiotropy, domi- 

 nant and recessive characters, presence and absence theorj^ and evolution.— C E. Leighty. 



262. Nutting, C. C. The relation of Mendelism and the mutation theory to natural selec- 

 tion. Science 53: 129-131. 1921. — The author aims to show that modern studies of genetics 

 have left the natural selection theory practically as it was left by Darwin. His contentions 

 may be summarized in 2 of his sentences: "Just as Mendelism has to do with the mechanism 

 and not the fact of heredity, so the mutation theory deals with the nature and not the fact 

 of variations. Neither, in my opinion, has any implication that is antagonistic to the theory 

 of natural selection." — F. B. Sumner. 



