292 Descendenz. — Morphologie. 



As the result of his experiments, the author arrives at the 

 following conclusions: 



„Taking these results together with Laxton's Statements, 

 and with the evidence afforded by the Telephone group of 

 hybrids, I think we can only conclude that segregation of seed- 

 characters is not of universal occurrence among cross-bred 

 peas, and that when it does occur, it may or may not follow 

 Mendel' s law. The law of segregation, like the law of domi- 

 nance, appears therefore to hold only for races of particular 

 ancestry. In special cases, other formulae expressing segre- 

 gation have been offered, especially by De Vries and by 

 Tschermak for other plants, but these seem as little likely 

 to prove generally valid as Mendel's formula itself." 



„The fundamental mistake which vitiates all work based 

 lipon Mendel's method, is the neglect of ancestry, and the 

 attempt to regard the whole effect lipon offspring produced 

 by a particular parent, as due to the existence in the parent 

 of particular structura! characters; while the contradictory 

 results obtained by those who have observed the offspring of 

 parents apparently identical in certain characters show clearly 

 enough that not only the parents themselves, but their race, 

 that is their ancestry, must be taken into account before the 

 result of pairing them can be predicted." Vines. 



Ducamp, L, De la presence de canaux secreteurs dans 



l'embryon de XHedera helix L. avant la maturation 



de la graine. (Congr. de l'Assoc. frane^ Ajaccio 1901.) 



L'auteur decrit les Stades successifs de la formation des canaux 

 secreteurs dans le pericycle de Taxe hypocotyle et des cotyledons de 

 YHedera helix. Ces canaux apparaissent de bonne heure et, ä la maturite 

 de la graine, ils peuvent dejä renfermer de la gommo-resine. 



Lignier (Caen). 



DUCAMP, L., Note teratologique sur le Typha latifolla. 



(Congr. de l'Assoc. franc. Ajaccio 1901.) 



L'auteur Signale et figure un echantillon de E. latifolia dont la 

 tige se terminait par deux epis femelles, situes cote ä cöte, incurves Tun 

 vers l'autre et reunis au sommet en un seul epi male, un peu aplati 

 comme dans une fasciation. Lignier (Caen). 



Perrot, E., Sur une particularite de structure o b - 

 serve'e chez certaines feuilles d' Aristolochia Sipho. 



| (Bulletin de la Societe botanique de France. Ser. IV. T. II. 

 1902. p. 163. Avec fig.) 



Des feuilles d'A Sipho presentaient sur Ieur face inferieure, 

 entre les nervures secondaires et parallelement a elles, des 

 expansions lamelleuses, allongees, fixees au limbe suivant leur 

 ligne mediane. Ces expansions dont la structure histologique 

 est identique ä celle du limbe, ne peuvent etre assimilees aux 

 domaties ou ascidies; elles ne sont pas non plus pathologiques; 

 peut-etre servent-elles ä augmenter la surface transpiratoire 

 du limbe? Lignier (Caen). 



