512 Scientific Proceedings, Royal Dublin Society. 
cipal product was the dextrorotatory pentacetylglucose previously 
made by Erwig and Konigs by the action of acetic anhydride 
and zine chloride on grape-sugar.! It melted at 110° C., and 
gave on analysis the following result :— 
0:1389 g. gave 0°2490 g. CO, and 0:0717 g. H.0. 
C=48:9, H =5°7. 
C,;H,.0,, requires C =49°2, H=56 per cent. 
It would thus seem that the formation of the chlorine com- 
pound is due to the pressure of the hydrochloric acid in the sealed 
tube. 
B33 Naphthylglucoside, C;H,,0;° O -C\.H,.—A solution of aceto- 
chloroglucose (70 grams) in absolute alcohol (150 c.c.) was added 
to (8 naphthol (23 grams) and potassium hydroxide (11 grams) 
dissolved in absolute alcohol, the total volume of the well-cooled 
mixture being about 300c.c. After a few minutes, the solution 
became turbid, owing to the separation of potassium chloride. 
After remaining for three days at the ordinary temperature, the 
yellowish-brown solution, which smelt strongly of ethylic acetate, 
was heated to boiling for 45 minutes under a reflux condenser, 
cooled and filtered. After removal of the alcohol and ethylic 
acetate on the water-bath, a little water was added, and the solution 
on cooling solidified. The product (46 grams), which contained 
some unchanged naphthol, was recrystallized from boiling water, 
and finally from absolute alcohol. It separated in groups of long 
needles melting at 184-186°C., and was dried at 105° before 
analysis. 
0-1806 gave 0'4150 CO, and 0:0944 HO, C =62:67, H =5:°81. 
: O,,H,.0, requires C = 62°74, H = 5°88. 
(8 Naphthylglucoside is soluble in alcohol or hot water, 
sparingly so in acetone, and almost insoluble in light petroleum, 
benzene, cold water, or ether. It is readily hydrolysed by dilute 
acids or emulsin, does not reduce Fehling’s solution before, but 
readily after, hydrolysis, and is stable towards dilute alkali, in 
which it is almost insoluble. The taste is disagreeable. 
1 Ber. 22 (1889), p. 1464. 
