No. 3, October, 1921] GENETICS 215 



Acad. Roy. BelgiqueCl. Sci. Ser. II.4: 1-108. 4 pi., U fig- 1920.— This work, describing the 

 results of the author's cytological stiidies on Campamda and the Compositae Ligulifiores, 

 is largely a critical review of the chromosome number reported for the various groups of the 

 plant kingdom. He concludes that there is no absolute relation between chromosome number 

 and plant complexity (taxonomic position), but that there appears to be a suggestive relation 

 between the chromosome number of plants nearly related, that is, plants within a taxonomic 

 group may possess chromosome numbers that may be arranged in geometrical or arithmetical 

 progression, indicating, possibly, a common ancestry which has given rise to the new forms 

 through chromosomal mutations of one kind or another. The usual methods by which the 

 chromosome number may be permanently modified are discussed. The volume and the dimen- 

 sions of chromosomes are very briefly considered. That markedly difierent plant forms may 

 possess chromosome complexes alike as far as number is concerned is intelligible to the author 

 in the light of the different physiological effects produced by bacteria morphologically 

 similar. — Robert T. Hance. 



1352. MiNOURA, Tadachika. a study of testis and ovary grafts on the hen's egg and their 

 effects on the embryo. Jour. Exp. Zool. 33: 1-61. 10 pi. 1921. — Following the grafting of 

 pieces of ovary (or testes) upon the embryonic membranes of developing chickens, deviations 

 from the normal in the reproductive systems of the hosts were observed in some instances, 

 pointing toward the production of hormones by the engrafted gonad capable of modifying 

 the development of the primary sex organs along the lines suggested by Lillie in accounting 

 for the free-martins. — H. D. Goodale. 



1353. MiYAZAWA, B. Studies of inheritance in the Japanese Convolvulus. Part II. 

 Jour. Genetics 11: 1-15. 1 colored pi. 1921. — The previous article states that yellow-leaved 

 plants never bear dark red flowers, but recently the author has obtained a yellow-leaved race 

 with dark red flowers. Various crosses are described with data, and the streaking on solid 

 colored flowers and the correlations of leaf and flower colors are noted. The observations 

 are interpreted on a factorial basis. G = gene for green color in leaf; D = dark red flower 

 color when the accompanying G is homozygous; B = blue color; M = modifier of tone of flower 

 color both in homozygous and heterozygous condition. Summary: (1) Light magenta color 

 in Fi is produced when both G and D are in heterozygous condition and bluing gene B and 

 modifying gene M are brought in from parent A. (2) Reciprocal hybrids are similar to each 

 other in all respects. (3) D produces dark red colors when G is present in homozygous condition 

 but dark red (magenta and scarlet) when G is heterozygous or absent. Such an interrelation 

 between G and D is found only in hybrids between plants A and B and does not exist in other 

 hybrids though C has colors closely related to those of B. (4) The fact that D has such a char- 

 acter is seen from results in which all 3 families of offspring of a hybrid which is green, white 

 and yellow, and deep scarlet, respectively, produced dark red colors. (5) The effects of B are 

 not manifested in individuals which are in the homozygous condition with respect to G. (6) 

 Magenta color appears in plants which have the constitution DB, either Gg or gg being 

 present at the same time. On the contrary, scarlet appears only in plants which are in condi- 

 tion Db. (7) White appears in individuals when D is absent and then G, B, and M may be in 

 any condition. (S) Interrelations between D and M are as follows: DdM = light color; DD 

 = medium color; DDmm and Ddmm = deep color. (9) Magenta color is dominant over scarlet 

 and dark red, and scarlet dominant over dark red. (10) There may exist homozygous plants 

 with respect to flower color with medium and deep tones of magenta, scarlet, and dark red, 

 but the authors have found no individuals with light tones of these colors. — E. E. Barker. 



1354. MoHR, Otto L. A case of hereditary brachyphalangy utilized as evidence in forensic 

 medicine. Hereditas 2 : 290-298. 10 fig. 1921 .—The publication deals with a paternity case 

 in which the author had to give an opinion as medical expert. The man upon whom an illegit- 

 imate child had been fathered denied the parentage. It w-as found that he suffered from a 

 pronounced case of a dominant hereditary brachyphalangy affecting the 2nd row of phalanges 

 on the II-IV fingers and toes; thumbs were normal but the basal phalanx of big toes was 

 shortened. The child's hands and feet exhibited an exactly similar malformation. Com- 



