Physiologie. 379 



which has been referred to as expressed protoplasm. Black- 

 man has proved that the ability to maintain a turgescent con- 

 dition is lost before disappearance of the respiratory function 

 and also that under the influence of high temperatiires photo- 

 synthetic activity is destroyed sooner than respiration. F r i e d e 1 

 in 1901 claimed to have extracted from spinach leaves a sub- 

 stance described by him as an enzyme capable, in the pre- 

 sence of suspended Chlorophyll under the influence of light, 

 of decomposing carbon dioxide. Macchiati, who has per- 

 formed similar experiments finds that leaf-powder dried at 

 100*^ C. will decompose CO2. Beijerinck extracted leaves by 

 powdering up in water, and filtered the extract. He found that 

 oxygen was liberated in the presence of light. This he be- 

 lieved to be due to the presence of „dissolved" protoplasm. 

 Mo lisch points out that such an extract after filtering still 

 contains entire chloroplasts and fragments of cytoplasm. If 

 carefully filtered through porcelain the extract loses its power 

 of C02-analysis. 



The author suggests that such results may be connected 

 with the existance of some substance more complex than an 

 enzyme but less so than a complete protoplasmic unit. 



E. Drabble (London). 



Gatin-Gruzewska, M'^^- Z., Resistance ä la dessiccation 

 de quelques Champignons. (C. R. Acad. Sc. Paris. 

 12 Dec. 1904.) 



Les experiences faites au laboratoire de Biologie vegetale 

 de Fontainebleau ont porte sur un grand nombre d'especes: 

 Polyponis fomeutariiis, P. betiiliniis, P. adustus, Lactarius 

 decipiens, etc. Les Champignons desseches pendant un temps 

 plus ou moins long ä l'air ou ä l'etuve ä 37^, reprennent leur 

 turgescence, leur couleur et leur odeur apres avoir ete hu- 

 mectes. Des Champignons frais et des Champignons desseches 

 puis humectes ont ete mis en experience dans de petites 

 cloches retournees sur le mercure, placees ä l'obscurite. L'air 

 a ete analyse. Les Champignons desseches puis humectes ont 

 presente une respiration notable (Ex. P. fomentariiis, cc.,23 

 de CO- degage par 1 gr. de poids frais et par heure chez le 

 temoin, Occ.,16 chez le Champignon qui avait ete desseche). 

 Dans une meme espece le quotient respiratoire a ete le meme 

 chez le Champignon frais et chez le Champignon qui avait subi 

 precedemment la dessiccation. 



Ainsi la reviviscence a ete mise en evidence par la mesure 

 d'un phenomene physiologique. jean Friedel. 



Lutz, L., Sur l'emploi de la leucine et de la tyrosine 

 comme sources d'azote pour les vegetaux. (C. R. 

 Acad. Sc. Paris. 6 Fevrier 1905.) 



Dans une precedente stii:- ü'essais de culture en presence 

 de leucine et de tyrosine, ajoutees comme source uniquc d'azote 



