180 
the entering again into solution of globulin, that the 
H-ion-concentration, by which the phenomena took place 
for the globulins were somewhat bigger, by which pro- 
cesses took place chiefly in very weak acid solution while 
our phenomena were principally observed in very weak 
alkaline solutions. 
The correspondence in the conduct of Chlamydomonas 
and of the globulins with regard to acid and alkaline 
solutions of salts, leads us to the suggestion, that the 
influence of electrolytes on the motility of our object is 
caused by the fact that the electrolytes work in upon the 
colloïds, which are present in the cell of Chlamydomonas, 
probably the plasmcolloïds. This hypothesis is not un- 
expected; we have already seen that there are many facts, 
which can be understood by it. Moreover one is univer- 
sally of opinion, that the protoplasm is colloïdal. 
$ 4 Description of the middle part of the curves. 
After we have examined the influence of the salts in 
the most alkaline and most acid solutions, we shall discuss 
the middle most parts of the curves. We are of opinion, 
that in the region which will now be discussed, we have 
chiefly to deal with the influence of the salt, while the 
H-ions and the OH-ions have a less great effect. 
For K,SO, (fig. 2 page 51) this part runs from 0,00015 n. 
H,SO, to 0,00100 n. KOH. For KNO, (fig. 5 page 57) 
and for KCI (fig. 4) the curves as far as they have been 
drawn belong entirely to this region. 
The course of these lines is somewhat capricious. This 
is caused by the presence of summits. 
With K;,SO, (fig. 2 page 51) we distinguish five 
(0,00005 n. H,SO,, 0,00005 n. KOH, 0,00040 n». KOH, 
0,00075 n. KOH and 0,00090 n. KOH). With KCI (fig. 4, 
