On thc influence of température on 

 the C02'assimilation of Helodea canadensis 



by 

 Miss J. E. VAN AMSTEL. 



INTRODUCTION. 



In a former publication about the influence of tempéra- 

 ture on physiological processes of the yeast ^) I showed 

 that in gênerai the studies on this subject had not been 

 carried out in such a manner that important conclusions 

 could be drawn from the results obtained. It was especially 

 demonstrated in the above mentioned study that the présent 

 data do not answer to the question whether there is a 

 différence between the influence of a rise of température 

 on a physiological and on a physical or chemical process. 



This view also concerns the influence of température 

 on the COo-assimilation, notwithstanding that Blackman^) 

 studied this subject on much better principles than his 

 predecessors. 



With regard to the discussion of B 1 a c k m a n's expe- 

 riments my above mentioned study ^) can be referred to, 

 and critical référence to earlier investigations ^) will be 

 omitted hère, partly because they hâve already been 



M Dissertation, de Bussy, Amsterdam 1912. 



-) Proceedings Roy. Soc. Vol. 83 B., 1911, p. 374. 



3) pag. 74. 



*) Sce: W. Pfeffer. Pflanzenphysiologie Bd. I. 



Recueil des trav. bot. Néerl. Vol. XIII. 1916. 



