250 Scientific Proceedings, Royal Dublin Society. 
iced-water until the xylose had completely dissolved. ‘This was 
completed in from two to three days, the solution becoming brown, 
and the reaction, as in the case of glucose, being attended by the 
production of a large amount of hydrochloric acid gas. The tube 
was then opened and the syrupy liquid, which had remained after 
the hydrochloric acid had escaped, was dissolved in chloroform. 
The solution was then washed first with cold water, and after- 
wards with dilute sodium bicarbonate, until the reaction was no 
longer acid. The chloroform solution was dried rapidly with 
calcium chloride, filtered, and the chloroform distilled off in 
vacuo. 
The syrupy residue crystallized on the addition of absolute 
alcohol, and was purified for analysis by redissolving in chloro- 
form and reprecipitating by addition of absolute alcohol. After 
drying in a steam-oven, the following results were obtained on 
analysis :— 
0:1786 grm. subst. . ; . 0:0864 erm. AgCl 
Cl 11°96 per cent. 
CH,;0,01 required Cl 12-02 per cent. 
Acetyl-chloro-xylose melts at 101°C. It is scarcely soluble in 
cold methyl or ethyl alcohol, but dissolves in hot alcohol, and is 
reprecipitated on cooling. (Prolonged boiling with alcohol 
converts it into a non-reducing derivative.) 
Conversion of Acetyl-chloro-xylose into [3a-Naphthyl-xyloside. 
To a solution of 0°28 gram of potash and 0°7 gram of 
a-naphthol in absolute alcohol, 1:5 grams of acetyl-chloro-xylose 
were added slowly with frequent shaking. Potassium chloride 
separated out; and the mixture smelt of acetic ester. Within 
twenty-four. hours a white crystalline solid separated from the 
solution. ‘The mixture was warmed until the solid had re- 
dissolved, and then filtered from the insoluble potassium chloride. 
On concentrating the solution on the water-bath, long needle- 
shaped crystals were obtained. 
The substance was purified by recrystallization from dilute 
alcohol, and, when dried at 100°C., began to soften at 191° C., 
