615 



a muco'JS one, it becomes evident what deslrnction the tnr[)ontine 

 has cansed there. 



We investigated therefore whether llie chemotaxis could not like- 

 wise be stimulated by injecting subcutaneously a solution of' turpen- 

 tine in NaCl 0.9 7o '" '^ concentraton of i : 10.000, instead of pure 

 turpentine. 



Provisional experiments have indeed shown that this has a favour- 

 able effect on chemotaxis. It was not considerable however. 



Probably this must be attributed to tiie ineffective manner in 

 which the experiments were carried, out. In the first place too little 

 was injected viz. only 5 times 5 cc. of a turpentine solution of 

 1:10.000, which means only a total amount of 0.0025 cc. of turpen- 

 tine. But especially too much time elapsed between the injections 

 so that the turpentine injected, had ample opportunity to be secreted 

 in large quantities by the kidneys, whilst the method of injection 

 adopted by Fochier creates a reserve of turpentine, from whence 

 turpentine is continually yielded to the circulation. 



In subsequent experiments, which, owing to lack of time, could 

 not be carried out as yet, the above-mentioned consideration will 

 be taken into account. 



As the technical difficulties attending turpentine-injections are being- 

 removed, it will be possible to make use of these injections much 

 more frequently in human [)athology ; meanwhile it may now be 

 concluded already from the foregoing experiments that turpentine 

 also stimulates chemotaxis in remote places. Further we may infer 

 from the greater mobility of the phagocytes, which is indeed also 

 the foundation of an increased chemotaxis, that in those places the 

 phagocytosis will be stimulated likewise. 



Groningen, November 1913. Pkyslo logical Laboratory. 



Botany. — ''Adjustment to light in oats" By W. H. Arisz. (C(un- 

 municated by Prof. Went). 



(Communicated in the meeting of November 29, 1918). 



§ 1. Introduction. 



In this preliminary communication there will be considered a 

 number of phenomena which are generally grouped as adjustment 

 phenomena (German : "Stimmung"). By functional adjustment is 

 usually meant the state of an organ which determines the effect 

 with which the latter reacts to a stimulus of a certain strength. 



