No. 4, January, 1921] GENETICS 245 



1675. Gauger, Martin. Die Mendelschen Zahlenreihen by Monohybriden im Lichte der 

 Dispersionstheorie. [The Mendelian ratios in monohybrids in the light of the dispersion 

 theory.] Zeitschr. indukt. Abstamm. Vererb. 22: 146 198. Mar., 1920. — The author exam- 

 ines numerical results of a number of breeding experiments and concludes that ratios actu- 

 ally observed agree with ratios of Mendelian theory as nearly as can be expected after taking 

 account of the mathematically probable deviations of the series observed. — R. B. Robhins. 



1G76. Goldschmidt, IliciiARi). Untersuchungen uber Intersexualitat. [Investigations 

 on intersexuality.] Zeitschr. indukt. Abstamm. Vererb. 23: 1-199. 2 pi., 84 fig. 1920. 



1677. Grafenberg, E. Die entwicklungsgeschichtliche Bedeutung der Hyperdaktylie 

 menschlicher Gliedmassen. [Developmental significance of hyperdactyly in human extremi- 

 ties.] Stud. z. Pathol, d. Entwickl. 2: 565-619. 1920. 



1678. Gutherz, S. Das Heterochromosomen-Problem bei den Vertebraten. Erste 

 Mitteilung: Untersuchung der friihen Oogenese der Hauskatze. [The heterochromosome 

 problem in vertebrates. I. Study of the early oogenesis of the domestic cat.] Arch. Mikros. 

 Anat. 94: 338-364. 1920. 



1679. Guyer, M. F., and E. A. Saiith. Transmission of eye-defects induced in rabbits 

 by means of lens-sensitized fowl-serum. Proc. Nation. Acad. Sci. (U. S.) 6: 134-136. Mar., 

 1920. — A brief account of experiments in which the writers appear to have been able to induce 

 specific antenatal lens-defects in rabbits, transmissible to later generations even through 

 the male line, by treatment of pregnant females with fowl-serum previously sensitized to 

 rabbit-lens. Among 61 surviving young of such treated females, there were conspicuous 

 eye-defects in 4 cases and noticeable defects in 5 others. No such eye-defects were found in 

 untreated rabbits or in control treated with unsensitized fowl-serum (12 cases) or with fowl- 

 serum sensitized to another rabbit tissue (36 cases). Similar eye-defects were also occasion- 

 ally induced in mice by similar methods. The defective eyes in rabbits have been trans- 

 mitted for 6 generations with increasing severity. — Sewall Wright. 



1680. Haecker, V. Uber Regelmassigkeiten im Auftreten erblicher Normaleigenschaften, 

 Anomalien und Krankheiten beim Menschen. [On regularity in the occurrence of hereditary 

 normal characteristics, anomalies and diseases in man.] Mediz. Klinik. 14: 977-982. 1918. — 

 The mode of inheritance of a trait is dependent upon the germinal complex which enters 

 into the zygote and also upon the developmental relations of the organ or part in which the 

 trait appears — the ontogenetic factor. If the part concerned has a high degree of develop- 

 mental autonomy — that is, if it acquires relative independence at an embryologically early 

 period — the trait is transmitted in ordinary Mendelian fashion. If there is a low degree of 

 autonomy with a consequent involvement of various developmental influences, simple Men- 

 delian heredity with segregation of traits does not occur, but, instead, a blending type from 

 which neither of the original parental forms is ever reproduced in any subsequent generation. 

 The blue eye color of certain Eskimos and others, shows the long-continued persistence of an 

 autonomous, and consequently Mendelian, character; the slightly mongoloid features of some 

 Hungarians and Turks represent the last vestige of blending traits. What sometimes 

 appears as a single trait need not necessarily be such. For example, in the case of albinism 

 there is an autonomous and a degenerative type. The former behaves in a clearly cut Men- 

 delian fashion, while the latter, which is in reality the labile expression of a generalized degen- 

 erative condition, behaves in an irregular manner alternating with, or being accompanied 

 by, various other aberrant conditions. Among digital anomalies, hypophalangy — a trait 

 presumed to be due to a single factor directly affecting only skeletogenous elements and 

 therefore displaying a high degree of autonomy — is a good Mendelian trait, while Polydactyly 

 — due to factors affecting several different elements and thus showing a low degree of auton- 

 omy — is transmitted irregularly and is often replaced by some other condition such as syn- 

 dactyly. — The characteristic failure of blending characters to show Mendelian heredity may 

 be due (1) simply to the extremely polyhybrid nature of the cross, (2) to a redistribution of the 



