166 Descendenz und Hybriden. — Morphologie und Teratologie. 



the season, when the last collections showed again a rise. The 

 rise in rnean values at both the beginning and end of the gro- 

 wing season was not in accord with the earHer resuHs of the 

 author, based on collections made in the same place in the 

 season of 1900. This fact is ascribed to the difference in the 

 climatic conditions, which were less favorable in 1903 than in 

 1900. Accompanying the low inean values of the later season 

 was a strong positive skewing of the curves, a remarkable rise 

 in the coefficient of variability, and a considerable increase in 

 the coefficient of correlation. The skewness is considered to 

 be due to the unequal sensitiveness of individuals to changes 

 of environment. It appears in general that considerable diffe- 

 rences may occur in individual Variation from year to year, so 

 that interpretations which have been based upon the assump- 

 tion that seasonal fluctuations do not occur, must be greatly 

 revised or even discarded. h. M. Richards (New York). 



Mac Millan , C. , Notes on some British Columbian 

 Dwarf Trees. (Bot. Gaz. Vol. XXXVIII. Nov. 1904. 

 p. 379—381. fig. 1—3.) 



Note on dwarf specimens of Picea sitchensis, Tsuga hetero- 

 phylla, Thuja gigantea, found growing on the west coast of 

 Vancouver Island. Ascribes their dwarf character to pressure 

 on root System and strong wind action. 



H. M. Richards (New York). 



Morgan, T. H., An Analysis of the Phenomena of 

 Organic „Polarity". (Science. N. S. Vol. XX. Dec. 2, 

 1904. p. 742—748.) 



Calls in question the idea of the flow of formative stuffs in 

 definite directions. Does not assume the existence of any 

 specific stuff apart from the iiving material itself. Suggests the 

 term : formative Organization for the property which iiving 

 material has to assume a specific form. 



H. M. Richards (New York). 



Peltrfsot, C. N., Developpement et structure de la 

 graine de quelques Ericace'es. — Note preliminaire. 

 (Journ. de Bot. 18^ annee. 1904. p. 234.) 



Dans cette note preliminaire, M. Peltrisot donne des 

 renseignements sur le developpement de la graine du Daboecla 

 poUfoUa D. Don. 



L'assise interne du tegument, assise epitheliale qui a repu 

 dans d'autres familles le nom de tapis, est bien developpee, 

 mais eile ne semble avoir ici aucun röle digestif. 



L'albumen est accompagne, au cours de son developpe- 

 ment, de deux organes, Tun micropylaire, l'autre chalazien qui 

 paraissent jouer un röle dans sa nutrition, Ces organes posse- 

 dent un protoplasme dense et des noyaux normaux qui pro- 



