April, 1920] GENETK 1 :,.'•; 



with white clover as the pollen parent. From this lael croi fivi I pi utl m re bl -. 

 four of which produced seeds, the fifth being at first totally sterile, l>ut when pro] 

 vegetativcly in 1914, about 20 plants were obtained most of them producing a small quantity 

 of seed. Eleven plants were obtained from this seed and in 1917 I re pollinated '.nth 



White Sweet Clover. Of the seven Fj plants of this cross one bore I- Bed of which 



produced the twin seedling illustrated. Two other twin plants were found in the progeo 

 the original cross but in a different line from the first one. — M . J . Uomey. 



1038. Terry, J. R. A wingless Wyandotte. Jour. Heredity 10: 176. Fig. 8. April, 

 1919. — A pullet without wings and a cockerel without tail occurred in a flock of oonnal chicks. 

 The pullet, mated to a normal male, has produced only normal chicks. — M. J. horsey. 



1039. Thompson, J. W. Breeding milk goats. Jour. Heredity 10:156-100. Fig. 5-5. 

 April, 1919. — An argument for more general use of the goat as a source of milk, on the basis 

 of quality of milk in nutrient elements and vitamines, greater hardiness, and ease and cheap- 

 ness of keeping. — M. J. Dorsey. 



1040. Tischler, G. Untersuchungen iiber den Riesenwuchs von Phragmites communis 

 var. pseudodonax. [Investigation of the gigantic growth of Phragmites communis var. pseudo- 

 donax.] Ber. Deutsch. Bot. Ges. 36:549-558. 1918. — The writer compared the cytology of 

 Phragmites communis with that of its variety pseudodonax, a giant form. The number of 

 chromosomes was the same in both cases, namely 36 (or 18 in the haploid phase), but in the 

 giant type they were unmistakably larger than in the ordinary form. As in the giant form 

 of Primula sinensis, the cells of the variety pseudodonax were in general larger than those of 

 the ordinary Phragmites communis. — Clara Fonteyn. 



1041. Tjebbes, K., and H. N. Kooiman, Erfelijkheidsonderzoekingen bij boonen. 

 [Genetical experiments with beans.] Genetica 1:323-346. 1 colored pi. 1919.— The pink 

 marbled Dwarf Prague bean is red-brown-striped on an ivory-colored ground. When crossed 

 with a yellow bean (d") of the type Non Plus Ultra, it gives in Fi beans whose seedcoat is 

 yellow-marbled on an ivory ground, and at the same time red-brown striped. The hybrid 

 behaves in F 2 as a monohybrid, though the seedcoats of the parents differ in more than one 

 character (color, spotting, taste). — A spontaneous hybrid from the yellow bean was blue- 

 black-marbled on an ivory ground. It produced, in respect to the characters concerning the 

 seedcoat, six phaenotypes. The factors, which were present in the hybrid in a heterozygous 

 condition, are the following: Z changes yellow to blue-black; V causes the marbling of the 

 seedcoat. The phaenotypes are these: Yellow, zzvv; yellow-marbled, zzVv; pink or violet 

 marbled; zzVV; blue-black, ZZvv or Zzvv; blue-black-marbled, ZZVv or ZzVv; Blue- 

 marbled, ZZVV or ZzVV.— All the marbled ones have an ivory ground. In order to ex- 

 plain these facts, we accept, (relying upon some previous researches), that we may compare 

 the factor V, in its effects, with a corrosive substance, and that its presence in a homozygous 

 condition destroys the pigment more than when present in a heterozygous condition. — //. A . 

 Kooiman. 



1042. Van Fleet, W. New pillar rose. Jour. Heredity 10: 136-138. Fig. 18-19. Mar., 

 1919.— A description of the parents and W. S. 18, a seedling of the cross (Rosa odorata X R. 

 wichuraiana) X (R. soulieana X R. setigera). W. S. 18 combines many of the desirable quali- 

 ties of all the parents and is especially recommended as a pillar rose. Many attractive 

 seedlings, some of dwarf growth with double, blush and white blooms borne throughout the 

 growing season, have been secured. — .1/. /. Dorsey. 



1043. Van Herwerden, M. A. De terugkeer van een sedert zeven jaar verdwenen ken- 

 merk in een cultuur van Daphnia pulex. [Reappearance of a character which had disappeared 

 for seven years, in a culture of Daphnia pulex.] Genetica 1 : 321-322. 1919.— In a culture of 

 Daphnia pulex bred for 9 years in the laboratory a part of the parthenogenetic young, leaving 



