32 Ci 
A s o, On the Nature of Oxidases. 
10 times of its volnme of water and tested again. Herenpon 
very strong color reactions for oxidizing enzyms were still ob- 
tained and a faint Glriess reaction, bnt tlie liberation of iodine 
was not more observed, wdiat is a fnrtlier proof tliat tbe sub- 
stance producing tbe guaiac reaction is not identical witli that 
wbicli produces the jodine reaction. 
Conclusion. 
1. The guaiac reaction for peroxids is not so sensitive as the 
potassium-jodid-starcli reaction. 
2. The guaiac reaction for nitrites is much weaker than the 
iodine reaction for nitrites. 
3. The reason why certain plantjuices which can liberate 
iodine loose that property on heating is very probably due to 
the acidity of the juice and the presence of traces of aniido- 
compounds, which is a very favorable condition for the decom- 
position of nitrites. 
4. It was positively shown that the substance which 
gives the guaiac reaction is not the same asthat wliicli 
liberates iodine. 
5. White the white Underground steni of the peaplant gave 
traces of nitrite reaction, this was never obtained with the green 
parts of fliese plants, nor with the root. 
