35 
With vanillin, at 100 c C., the following results were obtained: 
Name of phenol. 
Color with alkali. 
Pvrocatechin 
Dark blue to green. 
Purplish brown. 
Red, with slight greenish fluorescence. 
Deep purplish red. 
Yellow. 
Light red. 
Hvdroquinone 
Resorcin 
Trikresol 
Phloroglucin 
Thvmoi 
With cumarin, at 100 c C., concentrated sulphuric acid and the above- 
named phenols gave no highly colored compounds, the color varying 
from orange } T ellow in the case of phloroglucin to colorless in the 
case of trikresol. 
Control experiments were also tried in which these several phenols 
alone were heated with concentrated sulphuric acid to 160°-170 c C. 
for five minutes. On dissolving in water and making alkaline with 
sodium hvdroxide thev gave colorless or slightlv vellow solutions. 
The control with resorcin gave a slight greenish fluorescence on the 
addition of the alkali. This might have been due to impurities in this 
particular specimen of the compound. However, it is not sufficient 
to introduce any error or confusion into the results herein set forth. 
Aside from its utility in the tests herein described the fact that sac- 
charin and vanillin yield 
able chemical interest in itself. Further investigations along these 
lines will be carried out with the view of determining how advantage- 
ously saccharin can be employed in the synthesis of the sulphon- 
phthaleins, and with the view of determining the composition and 
nature of these vanillin d} T es, which, so far as I am aware, have never 
been described. 
d} T estuffs so readily is a matter of consider- 
