L71 
anions and cations of salts have an influence on the power 
of reaction of the object, we can proceed to the discussion 
of the conduct of the algae in acid and alkaline solutions 
of potassium nitrate, potomum chlorid, sodium acetate and 
potassium sulphate. Besides the various quantities of the 
dissolved salts these solutions contain regularly increasing 
or decreasing quantities of hydrions and hydroxylions. In 
the preceeding chapter we find stated, how the solutions 
were composed, there is also told which drawbacks belong 
to the working with these solutions. Moreover there is 
pointed to the fact, that always by the transport of the 
Alga into the fluids, the influence of which is examined, 
small quantities of moisture mix with the solutions, by 
which an inaccuracy crops up. 
Not only by the precautions, of which is spoken in 
the preceding chapter, the results have become much more 
certain, but also by the fact that all experiments, were 
carried out six fold. Each of the results is therefore an 
average from six experiments. An example can throw a 
clearer light on this proceeding. À series of solutions was 
prepared, which contained all 0,00040 normal potassium 
hydroxyd and different quantities of potassium nitrate namely: 
0,07, 0,08, 0,09, 0,10, and 0,11 normal, We call these 
solutions successively À, B, C, D and E. 
Solution À gave in six little tubes cleargrounds. With 
the solutions B, C, D and E, we could see a distinct 
amassing in 4, 3, 1. O, of the six tubes. In the graphical 
representations an amassing in six tubes is denoted by €; 
when in none of the tubes was observed a clear accu- 
mulation at the bottom, the mark O is used. For all 
cases where a part of the experiments gave accumulation 
and the remaining part no amassing, this result is denoted 
by a X. In the example we get: 
