436 Physiologie. 



Les experiences ont porte sur VOcyinum basilicum. A 

 l'abri de la lumiere, la plante est susceptible de consommer 

 l'huile essentielle qu'elle renferme et notamment les composes 

 terpeniqiies. 



Les matiferes odorantes ne sont donc pas des composes 

 d'excretion desormais inutilisables. A l'obscurite elles peuvent 

 contribuer soit ä former les tissus, soit ä fournir une fraction 

 de l'energie que n'apporte plus la lumiere. Jean Friede). 



EwART, A. S., Root-Pressure in Trees. (Anns. Botany. 

 1904. p. 181.) 



A tree of Ulmiis montana, 30 ft. high and branched at the 

 base was investigated. One trunk was cut across and no blee- 

 ding took place. The other trunk was ringed, about 8 — 10 

 annual rings being removed. Flowering and foliation were 

 hardly at all delayed. A root with diametre 2,5 cm. was cut, and 

 a manometre attached to either end. Sap escaped from the 

 end attached to the stem giving a pressure of 10 — 15 feet of 

 water — much more than necessary to drive water to the cut 

 end of the stump. 



On the second day the manometre attached to the severed 

 portion of the root recorded a pressure of 2 — 3 feet of water, 

 and on the fourth day nearly 6 ft. 



The second trunk was cut across but no bleeding at all 

 ensued. E. Drabble (London). 



Friedel, J., Assimilation chlorophyllienne en l'ab- 

 sence d'Oxygene. (C. R. Acad. Sc. Paris. 16 Janvier 

 1905.) 



Les experiences ont porte sur les feuilles 6! Evonymus 

 japonicus. Des feuilles placees dans un melange d'azote et de 

 gaz carbonique sans traces d'oxygene decelables au pyrogallate 

 de potassium, ont ete exposees ä la lumiere. Dans ces con- 

 ditions, on observe un degagement d'Oxygfene accompagne 

 d'une absorption correlative de gaz carbonique. 



Ainsi, la presence d'oxygene, dans l'atmosphere mise ä la 

 disposition d'une feuille, n'est pas indispensable pour l'accom- 

 plissement du processus d'assimilation. Jean Friedel. 



Griffiths, A. B. , On Geranium Chlorophyll. (Chem, 



News. Febr. 17* 1905.) 



The author believes that the Chlorophyll of geranium leaves 

 is a proteid and that Chlorophylls in general are probably albu- 

 minoids. Schunck and Marchlewski have shown that 

 Chlorophyll can be made to yield pyrrol, while indigo is a 

 derivative of Indol which may be obtained by the action of 

 pancreatic juice on albuminoids. E. Drabble (London). 



