66 GENETICS [Bot. Absts., Vol. V, 



spring of three plants, Petunia, Digitalis and Oenothera. Flowers of individual plants treated 

 with pollen from following sources: (1) from the same flower, (2) from other flowers on 

 the same plant, (3) from a sister plant, (4) from a plant of a different strain. In all but 

 the first the flowers were castrated. For (1) and (2) the same lot of pollen was used and ap- 

 plied at the same time. Fifty-two plants of Petunia were pollinated in this way and the pro- 

 genies of each, numbering at least 50 individuals in each class, were weighed. The results 

 show that in 37 cases the (2)-pollinated plants were heavier than (1) while in 15 cases the re- 

 verse holds. The other two types of pollination resulted in still heavier plants on the average 

 according to the dissimilarity of the parents. Four plants of Digitalis treated in like manner 

 show the same result, the cross-pollination between different flowers of the same plant give 

 heavier offspring than self-pollination within the individual flower. Oenothera gave no dif- 

 ferences. Antirrhinum, although not fully investigated, shows a difference between the pol- 

 linations. Author is unable to find any circumstances which might account for these effects 

 and considers them to be biologically not understandable. — D. F. Jones. 



488. von Oettingen. Die Vererbung erworbener Eigenschaften (aus dem Werke der 

 Pferdenzucht von Oberlandstallmeister von Oettingen). [The inheritance of acquired charac- 

 ters (from the work in horse-breeding by von Oettingen).] Deutsch. Landw. Tierzucht. 23:7. 

 1919. 



489. von Ryx, G. Ein neues Eeispiel einer Knospenmutation bei den Kartoffeln. [A 

 new example of bud mutation in potatoes.] Deutsch. Landw. Presse 2. 1 fig. 1918. 



490. von Tschermak, A. Der gegenwartige Stand des Mendelismus und die Lehre von 

 der Schwachung der Erbanlagen durch Bastardierung. [The present status of Mendelism and 

 the doctrine of the weakening of hereditary units through hybridization.] Naturw. Wochen- 

 schr. 17:509-611. 1918. 



491. von Tschermak, Erich. Uber Ziichtung landwirtschaftlich und gartnerisch wicht- 

 iger Hulsenfriichter. [Breeding of agriculturally and horticulturally important legumes.] Arb. 

 Deutsch. Landw. Ges. 1919: 80-106. 1919. 



492. von Tschermak, Erich. Bastardierungsversuche mit der griinsamigen Chevrier- 

 Bohne. [Hybridization studies with the green-seeded Chevrier bean.] Zeitschr. Pflanzen- 

 zucht. 7: 57-61. June, 1919. 



493. von Tschermak, E. Beobachtungen bei Bastardierung zv/ischen Kulturhafer und 

 Wildhafer. [Observations on hybridizations between cultivated oats and wild oats.] Zeitschr. 

 Pflanzenziicht. 6: 207-209. 1918. 



494. von Tschermak, E. Beobachtungen uber anscheinende vegetative Spaltungen an 

 Bastarden und iiber anscheinende Spatspaltungen von Bastardnachkommen speziell Auftreten von 

 Pigmentierungen an sonst pigmentlosen Deszendenten. [Observations on apparent vegetative 

 splitting in hybrid offspring, especially the occurrence of pigmentation on otherwise pigmentless 

 descendants.] Zeitschr. indukt. Abstamm. Vererb. 21: 216-232. 1 fig. Nov., 1920. 



495. von Ubisch, G. Gerstenkreuzungen. [Barley crosses.] Landw. Jahrb. 53:191-244. 

 S pi, 28 fig. 1919.— See Bot. Absts. 5, Entry 315. 



496. Waller, A. E. Xenia. School Sci. Math. 19: 150-157. Feb., 1919.— Popular ac- 

 count of xenia to which nothing new is added. — See also Bot. Absts. 5, Entry 115. — J. H. 

 Kemplon. 



497. Walter, F. K. tJber "familiare Idictie." [On familial idiocy.] Zeitschr. ges. 

 Neur. u. Psych. 40. 1918. 



