7. Restitutionslehre. 643 



an ear with semi-starchy seeds appears in pure non-starchy races. This 

 leads to the conclusion that either homozygous recessives are not complete 

 segregates but allow a trace of the character to remain; or „progressive 

 variations are constantly taking place in small numbers, most often along 

 paths tbat have been passed before". The latter alternative is the explanation 

 adopted. 



Two independent yellow colors were found in the endosperm, giving a 

 di-hybrid ratio. Purple x non-purple aleurone and non-purple x purple 

 always gives purple, tbus showing that the quality and not the quantity of 

 nuclear material is the determining factor. Splashed purples are believed to 

 be due to incomplete dominance, and not to the separate mosaic development 

 of the endosperm nucleus and one of the male nuclei, as Webber supposed. 

 Differences in prepotency of the purple character are believed to be due to 

 differences in gametic character, which merely modify the somatic appearances. 



Among other characters considered are the pods, pericarp color, silk 

 color, etc. Size characters are also believed to segregate in inheritance, as 

 shown by the fact the coefficient of Variation of the F 2 is from 50% to 

 100% greater than in F t . 



Various abnormalities appeared in the cultures, including two types of 

 dwarfs, and cobs with irregulär rows or lateral branches. These frequently 

 behave as dominant characters. The paper is an important contribution both 

 from the practical and the theoretical points of view. Several of the complex 

 ratios, however, require further explanation. Gates (St. Louis). 



1782) Pictet, A., Un nouvel exemple de l'heredite des characteres 

 acquis. 



(Arch. Sc. phys. nat. 31,6. p. 561—563. 1911.) 



Raupen (Lasiocampa quercus), denen statt der normalen Nahrung (Blätter 

 von Eiche, Rore usw.) ausschließlich Tannennadeln zur Verfügung gestellt 

 werden, greifen dieselben — nach vergeblichen Versuchen, sie wie flache 

 Blätter vom Rande her zu benagen — an der Spitze an und höhlen sie aus. 

 Wird den Nachkommen solcher an die neue Nahrung angepaßter Individuen 

 wiederum das normale Futter vorgesetzt, so werden blattlose Zweigspitzchen 

 angebissen und ausgehöhlt. M. Daiber (Zürich). 



7. Restitutionslehre. 



(Siehe auch Nr. 1753, 1754.) 



1783) Allen, W. E., A Study of the Relation of Tissue Differentia- 

 tion to Rate of Growth During Regeneration. 



(Biological Bulletin 21,4. p. 187-206. 2 charts, 6 figs. 1911.) 

 „The object of this study was to find whether the greatest speed of re- 

 generation occurs before or after or coincident with the completion of tissue 

 differentiation. If the same correlation holds that was noted by Minot (1908) 

 in ordinary growth, we should expect to find the rate of growth decreasing 

 after the major tissues have been well developed and still more so after diffe- 

 rentiation is essentially complete. In the hope of securing definite Information 

 the pressent effort has been made to secure data in that definite line, using 

 two distinct types for study." 



Two sets of experiments were performed: 1. On Limnodrilus claparedia- 

 nus, 2. On Amblystoma. The author's conclusions are: 



„1. When adult tissue is removed the resultant regenerative growth 



43* 



