785 
These data give occasion for a number of remarks and conclusions. 
a. In the first place it must strike us that the dissolving power 
of two samples of pure arachis oil) with regard to these acids 
appeared to be so very divergent. The difference amounts to: 
for cinnamic acid +14 °/, 
for salicylic acid +18 ,, > in the same direction’). 
for benzoic acid + 20 ,, 
The same thing appears on comparison of some of our data with 
those published by WAreRMAN®), though it should at once be stated 
that the latter determined the solubility by another and less accurate 
method than we. He found for the solubility in olive oil at 25°: 
of salicylic acid 2,59 gr. per 100 gr. of oil (hence 6.6 °/, more than 
we), of benzoic acid 4.33 gr. per 100 gr. of oil (hence 9.9 °/, more 
than we). 
It follows irrefutably from this that the solubility of some acid im 
a definite vil is by no means a constant, but that it varies with the 
inevitable oscillations in the constitution of this fatty oil. Undoubtedly 
this may be proved also for other substances than organic acids; 
we have only chosen these, because they can easily and accurately 
be determined by a titrimetric method. 
6. Of the six examined oils olive oil, cottonseed oil, arachisoil, 
and cocoanut oil agree with regard to their chemical constitution 
in so far that they all chiefly consist of glycerides of different acids 
of the fatty acid series, and of those of oleic acid and of linoleic acid. The 
differences consist chiefly in the different ratios in which these acids 
are present in the glycerides; thus cocoanut oil contains e.g. much 
trilaurine and trimyristine, on the other hand but little of glycerides 
of the unsaturated acids (the iodine number is accordingly very low); 
olive oil contains on the contrary very considerable quantities of 
these latter substances (in consequence of which the iodine-number 
is much greater) etc. 
As appears from table 1 we meet with a very different dissolving 
power with regard to the examined acids also in these closely allied 
oils. The difference between the highest and the lowest of the found 
solubilities is: 
by cinnamic acid + 37 °/, 
by salicylic acid + 33 °/, 
by benzoie acid + 26 °/, 
1) Cf. the extensive discussion in the Centralbl. f. Bakteriologie. 
3) Here and henceforth the meaning is: °/, of the lowest amount. 
8) Proefschrift Delft (1918) p. 79 et seq.; Centralbl. f. Bakteriologie 42, 639 
(1914) etc. 
