190 
glass has diminished very much already. So we find here 
under the influence of the electric phenomena at the surface 
of the glass, a removal 
of the fastening to less 
strong acid solution. 
With the attaching of 
o 
= Chlamydomonas the re- 
co 
ao moval was in inverse 
C 
sense; there the cilia 
were discharged in 
weakly alkaline solution. 
We may suppose that 
the thigmotactic reaction 
of Chlamydomonas with 
regard to the glass side 
takes place in all proba- 
bility under the influence 
of electric phenomena 
at the surface of the 
glass in acid solutions. 
The second pheno- 
menon, which may be 
connected with the iso- 
electricstateof the plasm- 
colloïds, namely the 
mutual sticking together 
of the individuals of 
Chlamydomonas,appea- 
red in the experiments, 
MNT because the algae at the 
conc.K,S0, 001 mo]. reaction to gravity often 
Fig. 6. formed, aggregates 
(conf. chapter II, $ 6). 
In which solutions the sticking together took place, 
was not noted down; however Î[ think to have ob- 
"100000 
