Physiologie. — Algae. 223 



RiCOME, H., Influencedu chlor ure de sodium sur la 

 transpiration et l'absorption de l'eau chez les 

 vegetaux. (Comptes rendus de TAcademie des Sciences 

 de Paris. 13 juillet 1903.) 



Des experiences prealables ont porte sur des feves et des 

 ricins cultives sur terrain depourvu de NaCl (liquide nutritif de 

 Knop). Une partie des plantes etaient portees dans le meme 

 liquide additionne de 1 pour 100 de NaCl. La transpiration est 

 a peine influencee au debut, l'absorption de l'eau par les racines 

 est diminuee par la presence de Nach 



Des experiences failes sur des plantes vivant normalement 

 au bord de la mer (Malcolmia maritima, Alyssiim maritimiun) 

 ont montre que le chlorure de sodium exterieur ä la plante 

 entrave l'absorption d'eau par les racines. La presence de ce 

 sei dans les tissus n'empeche pas la transpiration d'etre assez 

 intense quand l'absorption est favorisee. L'absorption et la 

 transpiration »ne presentent pas de relation constante. 



Bonnier. 



Bastian, H. Charlton, On some points in connexion 

 with the ordinary Development of Vaiicheria 

 Restingspores. (Annais and Magazine of Natural-History. 

 Ser. VII. Vol. XIl. No. 67. July 1903. p. 166— 174. PI. XIV.) 



The author describes the resting-spores of Vaiicheria 

 racemosa and especially refers to the pigment-heaps, composed 

 of fine granulär matter, present in these bodies. He asserts 

 that these pigment-heaps appear later in the germinating spore 

 as perfect spheres with sharply defined outlines and that they 

 have a movement of their own; and he considers that from 

 the mere heaps of pigment-granules present within the resting- 

 spores of certain species of Vaiicheria, independent amoeboid 

 animal organisms are formed, vvhich pass through definite 

 developmental phases. Thus an animal organism arises, which 

 has its origin in the substance of a plant. 



E. S. Gepp (nee Barton). 



Bastian, H. Charlton, On the Relations between certain 

 Diatoms and the fission-products of a Parasitic 

 Alga (Chlorochytriiim). (Annais and Magazine of Natural- 

 History. Ser. VII. Vol. XIL No. 67. Juli 1903. p. 175 

 —186. PI. XV.) 



The author describes and figures various stages in the 

 life history of Chlorochytriiim Knyamim. He compares the 

 mode of infection by Chlorochytriiim of Lemna minor^ L. glbha 

 and L. trisiilca, and then speaks of the association of the 

 fission-products of C Knyamim with various species of diatoms. 

 The diatoms have an immature appearance and the author 

 considers these plants have not, like the parasitic Chlorochy- 

 triiim entered the Lemna plant through the stomata but have 



