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THE AMEIUCAX XATUHALIST [Vol. XLVI 



it as highly probable that these cell organs are in some way 

 responsible for Mendelian phenomena, yet a large number of 

 biologists seem to be afraid to refer to them in this connection. 



Crosses between flint and dent varieties indicated that the dif- 

 ference between these two classes relates to two factors in some 

 case, especially when the dent parent has considerable corneous 

 endosperm, and to two or more factors, especially when the dent 

 parent has little corneous starch. This seems to be another case 

 where several similar factors exist, as found in earlier inves- 

 tigations by East, by Nilsson-Ehle, and by Shull. 



Crosses between races having different modal numbers of rows 

 of grain on the cob indicate clearly that several similar factors 

 are here concerned. The evidence that segregation occurs is, 

 the authors believe, conclusive. The data could not be definitely 

 analyzed because of the fluctuating variation of the various bio- 

 types, and the small differences between adjacent biotypes. 

 Height of stalk and length of ear behave similarly. Apparently 

 size of grain does the same. 



Irregular rows of grain occur both as fluctuations not inherited 

 and as a hereditary characteristic. Should the percentage of 

 irregular rows be higher than about 4 per cent, the authors think 

 the irregularity is probably hereditary. 



This paper closes with a discussion of the inheritance of var- 

 ious abnormalities found during the progress of the work. 



The Journal of Genetics for August, 1911, contains some arti- 

 cles of unusual interest. R. N. Salaman presents the results of 

 an investigation on the inheritance of the peculiar physiognomy 

 known as the Jewish face. He shows that this is a simple Men- 

 delian character. It is distinctly recessive to the ordinary Eu- 

 ropean (Gentile) physiognomy, though the hybrids sometimes 

 show traces of the Jewish face, especially late in life. On the 

 other hand, this peculiarity is dominant over the Pseudo-Gentile 

 face sometimes seen amongst the Jews ; also to the Gentile phy- 

 siognomy of the Moors and certain other Mediterranean peoples. 

 We may explain this in terms of the presence-absence hypothesis 

 by saying that the distinctive type of face seen amongst the 

 Hebrews is due to the presence of a gene, while in the peoples of 

 northern Europe there is a gene which inhibits the Jew face char- 

 acter. The data presented, while not extensive, seem to be quite 

 conclusive that the character segregates as a so-called unit char- 

 acter. Salaman 's paper is an exceedingly clear presentation of 

 data, and is written in a style that is attractive and readable. 



