384 Proceedings of the Royal Irish Academy. 



The carracryl-arabinoside was recrystallized from boiling water, 

 and dried at 100" C. for analysis: — 



0-1229 g. sbst. : 0-2869 g. CO, : 0'0897 g. H.O. 

 C 63-66, H 8-19 

 C15H22O.5 reqnii'es C 63-78, H 7-S7. 



Carvacryl arahino%ide (CgHsOi - • C'ello • CH., ■ C'^H:) crystal- 

 lizes from water in long needles, melting, when dry, at 119-120^0. 

 It dissolves in alcohol, ether, acetone, and chlexoform. It is insoluble 

 in carbon bisulphide and toluene, and sparingly soluble in cold water, 

 but readily in hot water. The pure substance does not reduce 

 Fehling's solution. "When heated for a short time with dilute sul- 

 phuric acid it is hydrolysed to carvacrol and arabinose. Carvaciwl 

 arabinoside differs fi-om carvacryl glucoside in its not being more 

 soluble in potash than in water. 



Conversion of AcetocMoroarahinose into fS-najihthyl-aralinoside. 



Acetochloroarabinose (3 grams), dissolved in absolute alcohol, was 

 slowly added to a solution of 0*6 gram potassium hydroxide and 

 1-5 gram yS-naphthol, also dissolved in absolute alcohol. The mix- 

 ture after a few minutes smelt of acetic ester, and quickly became 

 turbid from the separation of a white solid (potassium chloride). 

 After remaining at the temperature of the laboratory for one day it 

 was heated on the water -bath for a short time, and again allowed to 

 remain for three days at the ordinary temperature. The yellow 

 filtrate from the potassium chloride was heated on the water-bath, 

 under the reflux condenser, for half an hour, and the alcohol then 

 distilled ofi. The cold residue became solid on the addition of a little 

 water. The product was dried on clay, washed with chloroform till 

 colourless, recrystallized from boiling absolute alcohol, and dried at 

 105° C. for analysis : — 



0-1072 g. sbst. : 0-2562 g. CO, and 0-0562 g. H2O. 



C 65-18, H5-82. 

 C15H16O5 requires C 65-21, H 5-8. 



(S-yiaphthyl arabinoside crystallizes from absolute alcohol in long- 

 branching, grouped needles, which are visible and multicoloured 

 between crossed nicols. It dissolves in cold alcohol and acetic ester. 

 The crystals are scarcely soluble in benzene, chloroform, ether, water, 



