124 GENETICS [Bot. Absts., Vol. IV, 



this are briefly discussed. Author takes stand that standard and utility requirements are 

 not opposed, but that they may easily be combined and that breeders should give the matter 

 more careful attention. As an example of what can be done in this direction author cites 

 instances observed at the Government Poultry Farm at Beltsville, Md— Philip B. Hadley. 



771. Smith, Bktram G. The individuality of the germ-nuclei during the cleavage of the 

 egg of Cryptobranchus allegheniensis. Biol. Bull. 37: 246-286. 9 pi. Oct., 1919.— In the 

 fertilization of the egg of Cryptobranchus allegheniensis the germ nuclei do not fuse and in the 

 first division of the egg the chromosome groups are separate. Individuality of germ nuclei 

 has been traced to an advanced cleavage stage. — Karl Sax. 



772. Stakman, E. C., H. K. Hayes, O. S. Aamodt, and J. G. Leach. Controlling flax wilt 

 by seed selection. Jour. Amer. Soc. Agron. 2: 291-298. PI. 9. 1919.— The authors believe 

 that the decreased production of flax and the gradual movement of the center of production 

 to new lands is caused chiefly by the ravages of the flax wilt (Fusarium lini Bolley). Selec- 

 tion of wilt-resistant varieties is offered as a solution of the flax-wilt problem. Such selec- 

 tion work has been carried on in Minnesota since 1911. Varieties have been obtained which 

 show marked resistance to this disease. Plants were grown on infested ground and as a rule 

 bulk selection of seed from resistant plants was followed. This seed was planted again on 

 infested soil and additional selections made. Only one strain of the wilt-producing organism 

 has appeared and selections resistant at St. Paul, Minnesota, have also proved resistant at 

 Watseca, Minnesota. A seed-plot method is recommended for the flax producer by which 

 seed for the general crop is selected each year from plants grown the previous year on a small 

 plot of land badly infested with the wilt-producing organism. — G. P. McRostie. 



773. Steche, O. Grundriss der Zoologie. [Foundation of zoology.] 508 p. Veit u. Co.: 

 Leipzig. 1919. 



774. Stein, E. [German rev. of: Nuttall, J. S. W. A note on the inheritance of colour 

 in one breed of pigeons — an attempt to demonstrate a Mendelian type of transmission. Jour. 

 Genetics 7: 119-124. 1918. (See Bot. Absts. 1, Entry 234.)] Zeitschr. indukt. Abstamm. 

 Vererb. 21: 179. Sept., 1919. 



775. Stein, E. [German rev. of: Punnett, R. C, and P. G. Bailey. Genetic studies 

 in poultry. I. Inheritance of leg-feathering. Jour. Genetics 7: 203-213. 1918. (See Bot. 

 Absts. 1, Entry 492.)] Zeitschr. indukt. Abstamm. Vererb. 21: 179. Sept., 1919. 



776. Stein, E. [German rev. of: Jones, W. X., and M. C. Rayner. Mendelian inherit- 

 ance in varietal crosses of Bryonia dioica. Jour. Genetics 5 : 203-222. 1916.] Zeitschr. indukt. 

 Abstamm. Vererb. 21: 189. Sept., 1919. 



777. Stieve, Dr. H. tJber Hyperphalangie des Daumens. [On hyperphalangy of the 

 thumb.] Anat. Anzeiger 48: 64. Dec, 1919. — See Bot. Absts. 4, Entry 747. 



778. Stomps, Theo. J. Gigas-mutation mit und ohne Verdoppelung der Chromosomen- 

 zahl. [Gigas mutation with and without doubling of the chromosome number.] Zeitschr. 

 indukt. Abstamm. Vererb. 21: 65-90. 3 pi., 4 fig- July, 1919. — Studies on chromosome 

 numbers of semi-gigas ami gigas mutations in Narcissus. N. poeticus L., N. poeticus ,poe- 

 larum and N. poeticus ornatus, diploid number 16, present difficulties in counting. One 

 pair of "companion" chromosomes ("Trabanten") are attached to a longer pair at metaphase. 

 Apparent count, is thus 14, true count, 16. N. poeticus poetarum mut. "Glory of Lisse" and 

 "Albion," semi-gigas and gigas forms, respectively, as shown by comparison of their char- 

 acters with analogous forms of Oenothera (two tables of cell measurements and photographs 

 of plants, pollen and epidermis are given), have the normal diploid number of chromosomes. 

 N. biflorus Curt, found growing wild near N. poeticus is triploid and is a natural hybrid be- 

 tween ;i tetraploid N. i><nti<-us mut. gigas and N. tazetta. — Theory is developed that since, 

 in Narcissus, Primula sinensis (Gregory) and Oe. Lau <; mut. gigas, individuals are 



