198 Physiologie. — Algae. 



Ganong, W. f., An undescribed Movement of the 

 Branches in Shrubs or Trees. (Anna!. Bot. Vol. XVIII. 

 No. 72. Oct. 1904.) 



Some shrubs and small trees among which are Linderay 

 Salix and Broussonetia and probably many others exhibit a 

 well marked movement of their branches in winter — inwards 

 from winter to early spring, outwards as early spring sets in. 

 In addition to this primary or seasonal movement, there is an 

 inward movement with a fall in temperature, an outward move- 

 ment with a rise. These changes are probably brought about 

 by the larger or smaller quantities of water that the tempera- 

 ture determines in the plant. It is well-known that a fall in 

 temperature decreases osmotic absorption; at the same time 

 it is proved that transpiration goes on in the cold winter weather. 

 This may lead to a decreased water-content in the branches 

 during winter, the loss of turgidity thereby induced allowing 

 the natural inward spring of the branches to exert itself. As 

 the temperature rises (up to a certain point) the increased 

 absorption of water, leading to greater turgidity perhaps 

 accounts for the outward movement observed. 



D. Drabble (London). 



Verschaffelt, E., Unereactionpermettant de deceler 

 l'indol dans les parfums des fleurs. (Recueil des 

 travaux bot. Neerl. no. 1.) 



Si Ton depose une toute petite quantite d'indol ä la sur- 

 face de coton de verre imbibe d'acide oxalique concentre, le 

 tampon prend une teinte rose. De cette reaction, l'auteur s'est 

 servi pour reveler Findol, ou tout au moins des substances 

 chimiquement tres voisines de Findol, dans le parfum des 

 fleurs cueillies du jasmimim Sambac et du Citrus bigaradia. 

 Dans le parfum d'un grand nombre d'autres fleurs des corps 

 volatils colorant Facide oxalique ne purent etre deceles. L'exa- 

 men des fleurs du/ Sambac sur la plante elie-meme a demontre 

 la presence de l'indol dans le parfum des fleurs non cueillies. 

 D'ailleurs il s'est montre chez le /. Sambac, que seuls les lobes 

 de la corolle exhalent de l'indol, comme ils sont seuls ä 

 secreter des substances odorantes. G. j. Stracke (Arnhem). 



Fritsch, f. E., Algological Notes. No. 5. Some points 



in the structure of a young Oedogonium. (Annais of 



Botanv. Vol. XVIII. No. LXXII. October, 1904. Notes. 



p. 648—653. With fig. 61.) 



In the present note it is pointed out that in some species of Oedo- 

 gonium the basal cell is decidedly spherical or oval and can scarcely be 

 designated hemispherical. Such basal cells require some means of 

 attachment other than pure adhesion and in the case described this is 

 afforded by a dense mucilaginous mass of a hyaline appearance, which 

 more or less completety envelops the lower suriace of these basal cells; 

 this is probably the result of excretion, but no exact observations were 



