330 Descendenz u. Hybriden. — Morphologie etc. — Physiologie. 



are liable to assume gradually a yellowish tinge after hardening. 

 On Crossing piebald with yellow the latter was found to 

 be dominant, and in F2 the greens (no longer piebald) were 

 not found to be less sharply defined from the yeilows than 

 when pure green types were used. On crossing green with 

 piebald Fl was green. In some cases piebald seeds appeared 

 in F2. 



Cases of xenia were seen in ,,Fillbasket" and green „Tele- 

 phone" when fertilised by yellow types. 



The experiments on Sweet peas (Lathyrus odoratiis) were 

 carried out by W. Bateso n, Miss Saunders and R. C. 

 Punnett. It is impossible to give an adequate abstract of 

 their already Condensed account. The principal results deal 

 with the reversion in colour of the flowers obtained on crossing 

 white-flowered plants having „round" and „long" pollen respec- 

 tively, and with the proportions in which the series of types 

 of floral colours appear in F2 from such crosses. 



The report also contains an account of experiments with 

 poultry by W. Bateson and R. C. Punnett and independent 

 experiments with the same species of birds by C. C. Hurst. 



In conclusion remarks are made upon the following sub- 

 jects : 



1. Notes on the progress of Mendelian studies. 2. New 

 Mendelian cases. 3. Monolepsis. 4. Mixture of forms in Fi. 

 5. Pecularities of extracted types. 0. Resolution and disinte- 

 gration ; Synthesis. 7. Heterozygous breeds. 8. Sex. 9. The 

 moment of segregation. 10. Statistical consequences of Men- 

 delian segregation. 11. Concluding remarks on the new methods 



available for the Solution of the problems of heredity. 



R. H. Lock. 



Hill, A. W., Note on some peculiar features in seed- 



lings of Pepeiomia. (Proceedings of the Cambridge Phiio- 



sophical Society. Vol. XIII. 1905. Pt. 1. p. 20.) 



Seedlings of Peperomia iimbilicata (from A n d e s of B o 1 i v i a), thougli 

 dicotyledonous, only liberate one cotyledon to exercise the functions of 

 an assimilating organ, the other remaining in the seed for purposes of 

 absorption; other Andine and Central American species shevv the 

 same features. F. E. Fritsch. 



FlGDOR, W., Ueber Heliotrop ism us und Geotropismus 

 d e r GVß/;7//7C6'//-Blätter. (Ber. d. Bot. Gesellschalt. Bd. XXllI. 

 1905. p. 182-191.) 



Untersucht wurden Keimpflanzen von Avena sativa, 

 Thaledris canan'ensis, Seeale cereale, Triticiim vulgare, Hor- 

 deiim sativum und zwar immer das erste aus dem Cotyledo 

 hervorbrechende Laubblatt ; die beiden letztgenannten Species 

 eigneten sich minder gut für die Versuche, deren Anordnung 

 im Original näher geschildert wird. Bei allen war eine, wenn 

 auch geringe heliotropische Empfindlichkeit der Blattscheide 



