32 GENETICS [BoT. Absts., Vol. VIII, 



tion division as seems to be the case with animals. Cases are cited where the genetic con- 

 stitutions of male and female cells of plants are so diverse that it cannot be accounted for by- 

 segregation during the reduction division. Cases of linkage values different for the male and 

 female sex cells of the same plant are cited as exceptions to the ordinary mode of segregation. 

 Evidence that somatic segregation may influence genetic potentialities is furnished by sev- 

 eral citations in Avhich root cuttings produce plants differing in some characters from the 

 parent plant and from experiments upon rogues in peas. The author is led to believe that 

 segregation of hereditary genes may occur at any division in the life cycle. [See also Bot. 

 Absts. 8, Entry 214.]— J. L. Collins. 



227. Benders. [Dutch rev. of: Fleischer, Bruno, und William Josenhans. Ein 

 Beitrag zur Frage der Vererbung der familiaren Sehnervenatrophie (Leberscher Krankheit). 

 (Inheritance of familial atrophy of the optic nerve (Leber's disease).) Arch. Rass.- u. Gesell- 

 schaftsbiol. 13: 129-158. 5 pi. 1920.] Genetica 2: 532. 1920. 



228. Benders. [Dutch rev. of: Gross, K. Uber Vererbung von Augen- und Haarfarbe 

 und den Zusammenhang beider. (On inheritance of eye and hair color and the correlation 

 between them.) Arch. Rass.- u. Gesellschaftsbiol. 13: 164-170. 1920. (See Bot. Absts. 8, 

 Entry 266.)] Genetica 2: 534-535. 1920. 



229. Blaringhem, L. Stabilite et fertilite de I'bybride Geum urbanum L. X G. rivale L. 

 [Stability and fertility of the hybrid Geum urbanum L. X G. rivale L.] Compt. Rend. Acad. 

 Sci. Paris 170: 1284-1286. 1920. — Author pollinated Geu7n urbanum with pollen of G. rivale, 

 securing an Fi generation of 3 uniform plants. These gave seed for an F2 generation of 

 over 100 plants, 41 of which were used as basis of author's account. He described F2 group 

 as uniform and lacking Mendelian segregation and considers this crossing as exemplifying 

 his "heredite mixte" (see Bot. Absts. 4, Entry 523). There was an average of about 25 per 

 cent of imperfect pollen grains in F2. Author considers this hybrid type as similar to Geum 

 intermedium of taxonomists. — James P. Kelly. 



230. Bliss, A. J. Mendelian characters in bearded Irises. Jour. Roy. Hort. Soc. 45: 

 289-292. 1919. — A record of several varieties of bearded Iris including combinations of 

 variegata and neglecta types that tend to show that pigmented leaf base and brown-tipped 

 beard are Mendelian in character, possibly single unit characters. Bliss finds, however, no 

 apparent connection between these characters and color or type of flower. A cross of varie- 

 gata by amoena gave no squalens colors and "it almost looks as if amoena and variegata were 

 allelomorphic color varieties." — /. Marion Shull. 



231. Bonne VIE. Arvelighetsundersokelser i en norsk bygdeslaegt (Polydaktyli Tvilling- 

 fodsler). [Investigations of inheritance in a Norwegian family pedigree (Polydactyly, birth 

 of twins).] Videnskabsselskab. Kristiania Forhandl. (1918). 1919. — A considerable num- 

 ber of individuals in southeastern Norway have six fingers on one or both hands, and often 

 six toes on one or both feet. Sixth finger is on side of little finger. It appears to be a domi- 

 nant character through successive generations. All go back to one man from Ringebu in 

 Gudbrandsdal in middle of seventeenth century. Twins and triplets were numerous. Twin 

 mothers in all cases known have both parents from lines of twin-producing families, that is, 

 character appears to be recessive. — A. Gundersen. 



232. Bonnier, Gaston. Sur les changements, obtenues experimentalement, dans les 

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

 Rend. Acad. Sci. Paris 170: 135&-13o9. 1920. — Observations on seventeen lowland species 

 transplanted in same soil to high stations in the Alps and Pyrenees, which have come to 

 resemble after period of 30 to 35 years typical alpine species of same genera. Particulars are 

 given in each case. Author discusses briefly taxonomic problems raised by these results. 

 He holds that facts favor Lamarckian hypothesis that environmental change is one of prin- 

 cipal causes of transformation of organisms. — R. E. Clausen. 



