HO Physiologie. 



neutralisee exactement, le chauiiage provoque une creation 

 d'acidite. Jean Friedel. 



Reed, H. S., A Study o f the Enzyme secreting cells in 

 the seedlings o f Zea Mais and Phoenix dactylifera. 

 (Anns. Bot. Vol. XVIII. No. 70. April 1904.) 



The paper opens with a useful summary oi earlier 

 work on the structure of secretary cells. Korscheldt 

 (1889) found that the nuclei move to the apex of 

 the cells during active secretion and return to the base 

 during rest. He thought that some substance passed from the 

 nucleus into the cytoplasm, but did not insist on this point. 

 Miss Huie (1897 — 1899) found the cytoplasm of gland-cells in 

 Drosera to stain blue with Mann 's Eosin -Toluidin-blue during 

 rest. After secretion greater affinity was shown for the red 

 stain. During active secretion an increase in amount of chro- 

 matin and a decrease in size of the nucleolus were noticed; the 

 process of recuperation commenced in the nucleus. Rosen- 

 berg (1899) found in the same plant that during secretion the 

 chromatin granules run together and form rods, and if the 

 cells be very active, these rods may run together into a 

 thread. Mat h e ws (1899) stated that in the pancreas zymogen- 

 granules arise as products of decomposition of chromatin. He 

 failed to find any periodic alteration in the staining reactions 

 or in the amount of chromatin. Torrey (1902) said that in 

 Zea Mais the zymogen granules of diastase arise in the nucleus 

 and pass into the cytoplasm. 



Reed finds that in the resting condition the secretory cells 

 of the scutellum of Zea Mais and of the cotyledon of Phoenix 

 dactylifera are crowded with small proteid granules which dis- 

 appear as secretion continues. In Zea the disappearance coin- 

 cides with the consumption of endosperm, while in Phoenix it 

 precedes this. The chromatin of the nucleus is small in amount 

 at the commencement of secretion but increases as germination 

 progresses, the nucleolus at the same time diminishing. There 

 is no evidence for the extension of solid matter from the 

 nucleus. At the close of activity the protoplasm of the secretory 

 cells breaks down and disappears. E- Drabble (London). 



Saito, K., Enzyme in Aspergillus Oryzae. (Bot. Mag. Tokyo. 

 1903. Bd. XVIII. [Japanisch.]) 



Ausser den schon nachgewiesenen Enzymen konstatierte 

 Verf. in Asp. Oryzae noch das Vorhandensein von Labenzym 

 und Katalase. Loew. 



Saito, K., Ueber tryptische Enzyme in Pilzen. (Bot. 

 Mag. Tokyo. 1903. Bd. XVIII. [Japanisch.]) 



Verf. konnte bei Kulturen von 19 verschiedenen Mycelpilzen 

 in peptonhaltigen Nährlösungen die Bildung von Tryptophan 



