166 Vererbung, Variation, Mutation. 



Iwa L., were performed. The author reports that a study of the progeny of F 2 

 generation reveals a tendeney to Mendelian segregation both in height of plant 

 and habit of growth but that further study is necessary to confirm these points. 



Pearl. 



40-4) Gilbertsoll, A. N., Negro-Ute Metis. In: Jour. of Heredity, Vol. V, 

 No. 10, S. 463, Oct. 1914. 



In this note, accompanied by photographs, is recorded an instance of rare 

 mixture — two children of a negro father and Ute mother have the negro 

 characters most apparent but some features, particularly the hair of the girl, 

 show the Indian influence. Pearl. 



405) Marshall, F. B., Holstein Milk Yield. In: Jour. of Heredity, Vol. V, 

 No. 10, S. 436—439, 1914. 



In this paper the author reports the analysis of records in the Blue Book 

 compiled from the Advanced Register of the Holstein breed to show that there 

 is no evidence that milking capacity is transmitted through males rather than 

 females. Pearl. 



406) Boyle, H. H., The Siamese Pomelo. In: Jour. of Heredity, Vol. V, 

 No. 10, S. 440—444, Oct. 1914. 



In this paper is given a description of the habitat of the Siamese seedless 

 grapefruit or pomelo. Several types of this fruit seem to be genuinely seedless. 

 Occasional seed production is probably due to cross-pollination. Pearl. 



407) CollillS, G. N., Nature of Mendelian Units. In: Jour. of Heredity, 

 Vol. V, No. 10, S. 425—430, 1914. 



In this paper is discussed the bearing of Mendelian inheritance on the ori- 

 gin of characters and an extension of the theory of factored characters is sug- 

 gested. According to the Interpretation advanced, visible characters are to be 

 looked upon as complexes of an indefinite number of heritable elements which 

 are so small as to be immeasureable and which are more or less tenaciously 

 united. On the degree of coherence, or tenacity with which the elements are 

 bound together, depends the apparent regularity of the Mendelian behavior. If 

 the elements remain inseparably associated, the inheritance follows the simple 

 monohybrid ratio. If the elements separate into two or three groups, di- or tri- 

 hybrid ratios result. If the association of elements is still more completely dis- 

 solved, the inheritance is blended and apparently non-Mendelian. On breaking 

 up the characters, smaller groups of slightly coherent elements may form, and 

 these groups themselves may not be entirely independent. Pearl. 



408) Clark, J. A., Cereal Experiments at Dickinson, N. Dak. In: Bul. 

 U. S. Dept. Agr., No. 33, S. 1—43, Dec. 1914. 



In this bulletin is reported experiments on the testing and improvement of 

 cereal varieties. Spring varieties of wheat, oats and barley were largely used in 

 the experiments but some work was done with winter wheat and rye, spring 

 rye, emmer, flax, proso and grain sorghum. A large number of pure-line selec- 

 tions have been made from several unpedigreed varieties to improve the yield, 

 the milling and baking qualities. Considerable crossing with winter wheat has 

 been done in an attempt to originate new and better varieties which will have 

 better winter resistance. Pearl. 



