140 
For the greater part it is anorganic substances which in 
a colloïdal state, belong to the suspensoïds. The emulsoïds 
have absolutely different properties. Only very great 
saltconcentrations have an influence on the stability. The 
precipitation of these colloïds is called ,,salting out” anions 
and cations are both active. The valence of the ions does 
not act a great part, anions and cations can, as regards 
their influence, be put down in series (for the anions the 
series of Hofmeister). The charge of emulsoïds changes 
its sign if the solution is acid or alkaline. To the emulsoïds 
belong all sorts of organic substances for instance proteïns. 
When we ask to which group the plasma-colloïds should 
be reckoned to belong, we cannot give a satisfactory 
answer to that. From the few things that have come to 
light in this respect, it appears, as if, for the greater part, 
we have to do with emulsoïds which, possess however, 
some properties of the suspensoïds. So with substances 
between emulsoïds and suspensoïds. The charge of the 
plasmacolloïds depends on the reaction of the surrounding 
fluid. Small salt concentrations have an influence. The 
valence of the ions too plays a part. 
At present it is impossible to say, whether the reaction 
of phosphates or malates must be ascribed to the particular 
place, which these substances take up in the series of 
Hofmeister, or if we must pay a special attention to 
the polyvalence of the anion. 
Still another argument in favour of the colloïd chemical 
opinion can be found. The publication of Kniep (1905) 
denotes by numerous examples, how the chemotactical 
influence of a salt can be changed through the presence 
of other salts. We find there that KCC and NH,CI can 
paralyze each others effect. The same with K,SO, and 
: (NH,)SO,. However the sulphates are unable to diminish 
the effect of the chlorides. Peculiar is the effect of the 
mixtures of KCC and CaCl,. KCC has but little influence 
