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landing 24 hours, was the colour of the fyrup at 
-all changed, except by its limple dilution. 
Experiment II. 
A portion of the fame diflilled water, unim- 
pregnated with fixed air, was mixed with the 
fyrup in the fame proportion : not the lead: differ- 
ence in colour could be perceived betwixt this 
and the above mentioned mixture. 
Experiment III. 
One drop of oil of vitriol being mixed with a 
pint of the fame diflilled water, an ounce of this 
water was mixed with a tea-fpoonful of the fyrup. 
This mixture was very diftinguifhable in colour 
from the two former, having apurplifh calf, which 
the others wanted. 
Experiment IV. 
The diflilled water impregnated with fo fmall a 
quantity of vitriolic acid having a more agreeable 
tafle than when alone, and yet manifefting the 
prefence of an acid by means of the fyrup of vio- 
lets ; I fubje&ed it to fome other teffs of acidity. 
It formed curds when agitated with foap, lathered 
with difficulty, and very imperfectly ; but not the 
leaf! ebullition could be difcovered upon dropping in 
fpirit of fal ammoniac, or folution of fait of tartar, 
though I had taken care to render the latter free 
ifom cauflicity by impregnating it with fixed air. 
- Ex- 
4 
