248 GENETICS [BoT. Absts., Vol. VII, 



1722. Bannier, J. P. [Dutch rev. of: Stout, A. B. Intersexes in Plantago lanceolata. 

 Bot. Gaz. 68: 109-133. 1919. (See Bot. Absts. 3, Entry 1517.)] Genetica 2 : 47&-477. Sept., 

 1920. 



1723. Baumann, E. Beitrage zu der Individual- und Immunitatsziichtung bei der Kar- 

 toffel. [Contributions on the question of individual and immunity breeding of the potato.] 

 Jour. Landw. 68: 145-206. 1 fig. 1920.— These investigations on two commercial varieties of 

 potatoes show the practical possibility of increasing production of the crop by means of 

 pure-line selection, securing in this way strains that are resistant or practically immune to 

 several diseases. Data are given on these points: plant yield; starch content and starch 

 yield, with correlation of these; number, size and starch content of tubers; correlation of 

 number and size of tubers with tuber yield and starch yield; influence of weather conditions 

 and disease on yield; food qualities and cooking values. — C. E. Leighty. 



1724. Becker, J. Xenien zwischen Melonen und Gurken. [Xenia between muskmelons 

 and cucumbers.] Zeitschr. Pflanzenzucht. 7:362-364. Nov., 1920. 



1725. Benders. [Dutch rev. of : Doter, J. J. Th. Proeve van een onderzoek omtrent het 

 familiair en hereditair voorkomen van tuberculose volgens de wetenschappelijkgenealogische 

 methode. (Preliminary researches about the familial and hereditary occurrence of tubercu- 

 losis following scientific genealogical methods.) 214 p., 7 genealogical trees, and 258 quarter 

 tables. Diss. J. B. Wolters U. M. : Groningen, 1920. (See Bot. Absts. 6, Entry 1074.)] Ge- 

 netica 2: 453-459. Sept., 1920. 



1726. Benders. [Dutch rev. of: Slye, Maud. The relation of inbreeding to tumor 

 production: studies in the incidence and inheritability of spontaneous tumors in mice. Jour. 

 Cancer Res. Jan., 1920.] Genetica 2: 475. Sept., 1920, 



1727. Blakeslee, A. F. A dwarf mutation in Portulaca showing vegetative reversions. 

 Genetics 5:419-433. 1 fig. July, 1920.— One compact dwarf plant, found in a sowing of 

 Portulaca grandiflora, was crossed with varieties of the normal form. The normal appeared 

 completely dominant. The dwarfs showed no red in the stems (except in the seedling stage) 

 while the corresponding normals did. Dwarfs selfed gave 2653 dwarf to 14 normal. With this 

 exception, normal and dwarf were proved to act as a simple Mendelian pair, assuming that 

 the dwarfs are less viable. Ten of the selfed dwarfs produced 1294 dwarfs, which were spe- 

 cially examined, and 16 bore some normal branches with long internodes and red stems. These 

 branches were shown to be heterozygous; while the other branches of the plants which bore 

 them proved to be homozygous dwarf. Since these ten parents also bore 7 normals, there 

 was a total mutation from recessive to dominant of 1.8 per cent. Mutations, like the original, 

 from dominant to recessive, could not be visible in homozygous normals, and might readily 

 be overlooked in heterozygotes.— Jo/m Belling. 



1728. Bonnier, Gaston. Sur les changements, obtenus experlmentalement, dans les 

 formes vegetales. [On the alterations experimentally obtained in the form of plants.] Compt. 

 Rend. Acad. Sci. Paris 170: 1356-1359. 1920. 



1729. Broili. Solanum edinense Berthault, ein fiir die Landwirtschaft wertvoller Kart- 

 offelbastard. [Solanum edinense Berthault, a potato hybrid valuable for agriculture.] Deutsch. 

 Landw. Presse 1920: 359-361. 1920. 



1730. Brozek, Arthur. Mosaikbastard. Mimulus tigrinoides Hort., hybrida var. 

 Paulina (var. nova). [A mosaic hybrid. Mimulus tigrinoides Hort. hybrida var. Paulina 

 (var. nova).] Lekafske Rozhledy 7: 8-12, 221-232. 1920. 



1731. BRtJEL, L. [German rev. of: Roux,W. Uber die bei der Vererbung von Variationen 

 anzunehmenden Vorgange, nebst, einer Einschaltung uber die Hauptarten des Entwicklungs- 

 geschehens. (On the putative processes in the inheritance of variations and an interpolation 

 on the chief kinds of developmental phenomena.) Vortr. Aufsatze u. Entwicklungsmech. 

 Org. 68 p., 1913.] Zeitschr. Indukt. Abstamm. u. Vererb. 24: 291-292. Nov., 1920. 



