120 Physiologie. 



to the Stimulus of the injury and is not really a correlation at 

 all. He also adduces new observations on cuttings of Ampe- 

 lopsLs qiiinquefolia in support of his previous conclusions. 



S. H. Vines. . 



ViNES, S. H., The Proteolytic Enzyme of Nepenthes. (III.) 

 (Annais of Botany. Vol. XV. No. 60. p. 563. Dec. 1901.) 



This paper is a reply to a recent publication by the late 

 Georges Clautriau in which it was argued that the enzyme 

 Ol Nepenthes is not tryptic but peptic. (La Digestion dans les 

 Urnes de Nepenthes, Mem. couronnes, Acad. roy. de Belgique. 

 T. LIX. 1900.) 



The author finds that the enzyme of Nepenthes (nepenthin) 

 produces the substance tryptophan in the digestion both of 

 fibrin and of peptone, which gives a pink or violet colour on 

 the addition of chlorine-water, and which is regarded as a 

 characteristic product of tryptic digestion. He finds that other 

 proteolytic enzymes of plants, such as Bromelin (Ananassa sativus) 

 and Papain (Carica Papaya), also produce tryptophan. Hence 

 he concludes that all these enzymes are essentially tryptic 

 although acting in an acid medium, and suggests that probably 

 all vegetable proteolytic enzymes are tryptic. s. H. Vines. 



Arber, E. A. N., The Effect of Nitrates on the Carbon- 

 Assimilation of Marine Algae. (Annais of Botany. 

 Vol. XV. No. 60. p. 669. Dec. 1901.) 



The author finds 1. that the addition of a nitrate to sea- 

 water causes Inhibition of COa-assimilation in Viva; 2. that the 

 inhibition is marked when 0,5 per cent KNO3 is added, less 

 marked on the addition of an equivalent quantity of NaNOs, 

 still iess with an equivalent quantity of Mga (NO3), but more 

 strongly marked on adding an equivalent quantity of NH4 NO3 ; 

 3. that the addition of potassium phosphate (P/o) also causes 

 inhibition; 4. that there is a considerable storage of starch, and 

 a very slow translocation, in Viva, Enteromorpha and Clado- 

 phora. S. H. Vines. 



TsVETT, M., Recherches sur la Constitution physico- 

 chimique du grain de chlorophylle. (Extrait des 

 Travaux de la Societe des Naturalistes pr^s l'Universite de 

 Kazan. T. XXXV. Livr. 3. 8^ XII und 268 pp. 1 Tafel. 

 Kazan 1901. [Russisch.]) 



Vorliegendes Werk bietet eine ausführliche Darstellung der 

 bisherigen Chlorophyll-Untersuchungen des Verf. 



In der Einleitung werden die Ziele und Wege der physio- 

 logischen Chemie auf dem Gebiete des Chlorophylls besprochen. 

 Es wird betont, dass die Chlorophyllchemie nur insoweit ein 

 biologisches Interesse beanspruchen kann, als sie sich zunächst 

 die Aufgabe stellt, natürliche genuine Stoffe darzustellen und 

 zu studiren. 



