of Edinburgh, Session 1864 - 65 . 411 
Both the solution and the crystals have a strong and persistent 
smell of honey. 
When heated, the crystals fuse, and at a higher temperature 
boil, readily volatilising far below the boiling point. 
The fusing point was found to be 76° C., and the boiling point 
(corrected) 264° 0. 
Combustion with oxide of copper and oxygen gave the following 
results : — 
I. 0-2422 grm. gave 0-1344 water. 
II. 0*2212 grm. gave 0*1297 water and 0*5803 carbonic acid. 
Indicating the formula CgHg02. 
Calculated. 
Observed. 
I. II. 
96 70*6 
... 71*5 
8 5*9 
6*2 6*5 
32 23*5 
••• 
136 100-0 
Hydriodic acid, therefore, acts in the same way on mandelic acid 
as on lactic acid. The reaction probably takes place in two stages, 
and may be expressed thus : — 
A lime salt prepared by boiling the acid with powdered Iceland 
spar crystallised in radiated needles, readily soluble in water. 
Analysis of the salt dried in vacuo over sulphuric acid gave the 
following results : — 
I. 0-0977 grm. lost 0*0101 at 130° C. 
II. 0*2459 grm. gave 0*0386 quicklime. 
III. 0*2674 grm. gave 0*0419 quicklime. 
These results agree with the formula C^ 6 Hi 4 Ca 04 + 2 H 2 O. 
Calculated. Observed. 
I. 
C.gHj^CaO^ 310 89*6 89*7 
2 II 2 O 36 10*4 10*3 
346 100*0 
1000 
