790 



Probably in close connection with ttie behaviour of globulins in 

 acid and in alkaline solutions is the fact that the acid concentration 

 at which the globulins went into solution, is very dependent on 

 the nature of the salt present in solntion, while the concentration 

 of alkali is much less influenced thereby, if at all. This also was 

 shown by Hardy. 



A corresponding peculiarity came to light in our experiments on 

 the motility of Cklamyiloiaonas. We found that the acid concentra- 

 tion in acid nialate solutions was displaced in relation to that in acid 

 acetate solutions, whereas the alkali concentration in malate solutions 

 was not so displaced in relation to that in acetate solution (see p. 787). 

 In 80 far as concerns its motility with regard to acid, base, ac id i c 

 and alkaline salt solutions, the behaviour oï Chlamydomonas 

 therefore showed a striking correspondence to the behaviour of 

 emulsoid solutions of globulins with regard to the same leagents. 

 We may therefore suppose, that the motility of Chlamydomonas 



under the influence of acid 

 and alkaline salt solutions, 

 depends on a colloidal-chemi- 

 cal change of the cell, most 

 probably of the protoplasm. 

 This hypothesis is not wholly 

 unexpected. Protoplasm is 

 generally regarded as a col- 

 loidal mass. According to our 

 observations the plasma colloids 

 would show some of the pro- 

 perties of emulsoids. After 

 having observed the corre- 

 spondence between the effect 



a o 



:^ 5 

 o 



3: ë 



2 •* 

 a -4 



conc.KNOj 



8 <} 10 \\ 12 \3 

 0,01 n. 



Fig. 3. 



of acid and of alkaline solutions on the motility of Chlamydo- 

 monas and their effect on the emulsoid globulins, we will next try to 

 as certain wliether the influefice of sa 1 ts ^) on the motility of the alga 

 shows any agreement with their action on emulsoids or indeed on suspen- 

 soids. For this purpose we must examine the portion of the curve for 

 K,SO, between 0.00015 n. H,SO, and 0,00100 n. KOH (Hg. 1) and also the 

 curves for KCl (fig. 4) and for KNO, (fig. 3) in so far as they are plotted. 

 These portions of the curves differ somewhat in shape. For KNO, 



' ) We suppose that in the portions of the curves now to be discussed, the 

 influence of the salt predominates, while in the portions which have already been 

 dealt with the influence of acid and base was more prominent. 



