No. 1, July, 1920] GENETICS 77 



513. Anonymous. [Rev. <>f: Sumner, F. B. Continuous and discontinuous variations 

 and their inheritance in Peromyscus. I, II, III, Amer. Nat. 52: 177 208, 200 300, 439 154. 

 1918.] Trans. Amer. Microao. Soc. 38:238-239. July, L919. — See Bot. Abets. 1, Entries! 



943; 



514. Bach, SIEGFRIED. Noch ein Bastardierungsversuch Pisum X Faba. [Another 

 hybridization experiment Pisum X Faba. Zeitschr. Pflanzenz icht. 7:7:: 7!. June, 1!M9. — 

 Sec Bot. Ab ts. 4, Entry 2172. 



515. Bach, Siegfried. Zur naheren Kenntnis der Faktoren der Anthozyanbildung bei 

 Pisum. [To a more exact knowledge of the factors for the formation of anthocyan in Pisum.] 

 Zeitschr. Pflanzenzucht. 7: 64-66. June, 1919. -See Bot. Absts. 4, Entry 217:;. 



516. Ballard, W. R. Notes on geranium breeding. Proc. Amer. Soc. Hortic. Sci. 15: 

 62-65. 1918. — A brief description is given of several varieties of geraniums; "the geranium" 

 of the garden not being a true Geranium but of the genus Pelargonium, probably derived from 

 P. zonale and P. inquinans. The Snow, or Lady Washington, apparently descended from 

 P. cucullatum and P. angulosum. The scented-leaved type is probably P. pellatum. In a 

 study of resistance to a leaf and stem spot disease many types were found resistant when 

 leaves are protected from rain. Disease resistance and flower characters are difficult to 

 combine by breeding. Many seedlings exhibit increased vigor for several years, but degen- 

 erate. A list of crosses of like and different flower types shows singleness to be dominant. 

 The nectar tube adnate to the flower stem in the true genus Geranium, is not constant in the 

 zonal group and does not appear in the double flowers of any cross. It is apparently corre- 

 lated with singleness. Species crosses are difficult and where possible the plants are not 

 very fertile. — .1/. J. Dorsey. 



517. Banta, A. M. The results of selection with a Cladocera pure line. Proc. Soc. Biol, 

 and Med. 16: 123-124. 1919.— Attempts to obtain by selection diversities with respect to 

 reactiveness to light within parthenogenetic pure lines (clones) of three species of Cladocera 

 were positive in one line of Simocephalus vetulus. Averages for two-month periods were 

 made for 54 months during which 181 generations were obtained. Considerable fluctuation 

 in reactiveness was noted but in course of time the mean for the plus strain decreased to one- 

 half and finally to one-third that of the minus strain. Diversities in reactiveness were not 

 due to differences in vigor. — R. W. Hegncr. 



518. Baumann, E. Zur Frage der Individual- und der Immunitatszuchtung bei der Kar- 

 toffel. [On the question of individual selection in potatoes and the breeding for immunity.] 

 Fiihl. Landw. Zeitg. 67: 246-253. 1918— See Bot. Absts. 4, Entry 1239. 



'519. Beatjverie, J. The present state of the study of anthocyanin. Rev. Gdn. Sci. 29: 

 572-579. 1 Jig. 29: 601-612. 1918.— A review of the work on anthocyanin,— its distribution 

 and its chemical, physiological, cytological and genetical status. The genetic treatment is 

 very brief, dealing mostly with the work of Keeble and Armstrong and Miss Wheldale. 

 — E. W. Lindstrom. 



520. Benders. [Dutch rev. of: De Wilde, P. A. Verwantschap en Erfelijkheid bij 

 doofstomheid en retinitis pigmentosa. (Relationship and heredity in deaf-and-dumbness and 

 retinitis pigmentosa.) Diss. Amsterdam. 1919.] Genetica 2: 90-91. Jan., 1920. 



on 



521. Bielschowsky, Max. Entwurf eines Systems der Heredodegenerationen des Zen- 

 tralnervensystemseinschliesslich der zugehurigen Striatumerkrankungen. [Suggestion of a sys- 

 tem of hereditary degenerations of the central nervous system inclusive of the associated dis- 

 eases of the striatum.] Jour. Psychol. Neurol. 24:48-50. 1918. — Author expresses opinion 

 that the underlying cause of many diseases involving the corpus striatum is a defective germ- 

 plasm, and that even in certain cases where similar ancestral manifestations are not demon- 



