32 
least partly), to the experimental errors, which were very large 
with the old Soja-meal. 
In an earlier stage of these researches the influence of neutral 
substances like alcohol on urease-action had been studied with the 
aid of the ammonium-carbonate —- carbonic acid as a buffer, in 
experiments like those described in part 6. 
For instance the experiment of May 25th 1916, in which 0,5 °/, 
of urea in ammonium carbonate (= 2°/, urea) with and without 
5°/, of aleohol had been investigated, produced the results, represent- 
Figure 7. 
5 9/9 alcohol 10 0/, alcohol 
40 80 120 160 200 240 40 80 120 160 200 240 
minutes. 
ed in figure 7. The mean of m without alcohol was 0,00381, with 
5 °/, alcohol 0,00335. For the calculation of m it was assumed, that 
the py had been elevated by 5°/, alcohol in this case by the same 
value as found above in the phosphate solutions. 
From figure 6 it will be seen, that between py == 7 on the ori- 
ginal curve and py=‘7%,1 on curve II, theory would predict a 
decrease in m from 51,3 to 44,5, that is from 1 to 0,87. 
According to the above results a decrease is found from 38,1 to 
33,5, that is from 1 to 0,88. 
Closer consideration as well as further experimental research 
showed however, that the problem is more complicated than repre- 
sented so far. 
