218 Proceedings of the Royal Society of Edinburgh. [Sess. 
Further confirmation of the identity of this sublimate with anhydrous 
rhamnose was given b}^ the formation of the phenylosazone, the needle- 
shaped crystals melting at 179-180°, whereas the melting-point given by 
Fischer is 180°. 
There can therefore be no doubt that the sublimate thus formed is 
anhydrous rhamnose. 
It was thought advisable to examine the melt which remained in the 
outer tube, and from the results of the examination it is clear that it is 
also anhydrous rhamnose, though it is difficult to explain the variation 
in specific rotation. The analysis : 
Found. 
Calc, for C 6 H 12 0 5 . 
C = 43-75 
H= 7-26 
. 
43-90 
7-31 
showed close concordance between the observed and the calculated values. 
The rotation values were : — 
For cone. = 2*932 . . lal — = 5*80° 
L J D 
For cone. = 4'904 . . . [a]^ = 3-6o° 
Neither this substance nor the sublimate showed mutarotation. The 
phenylosazone obtained from the melt was identical with that from the 
sublimate. 
Fructose. 
The low melting-point of this sugar suggested that it might behave 
similarly to rhamnose, and preliminary experiments show that at from one 
to two millimetres pressure and about 100° fructose does sublime, though 
much less rapidly than is the case with rhamnose. 
Chemistry Department, 
University of Edinburgh. 
( Issued separately November 30, 1916.) 
