28 Mr Jones, The Solubility of Stereoisomericles 
quantity of the solution and weighing the residue. (This is im- 
possible in the case of camphor on account of its volatility.) 
(1) d camphoroxime in turpentine at 18° C. 
cl d in a 2 decimetre tube = 2*30°. 
Specific gravity = ‘8784. 
Solubility 8*68 grams, in 100 grams, of solvent. 
(2) l camphoroxime in turpentine at 18° C. 
a D in a 2 decimetre tube = 18*24°. 
Specific gravity = *8782. 
Solubility *8*69 grams, in 100 grams, of solvent. 
(3) d camphoroxime in l amyl bromide at 15° C. 
a D in a 1 decimetre tube = — 3*55°. 
Specific gravity = 1*199. 
(4) l camphoroxime in l amyl bromide at 15° C. 
a D in a 1 decimetre tube = + 11*48°. 
Specific gravity = 1*199. 
(5) d camphor in turpentine at 15° C. 
ol d in a 1 decimetre tube = 23*07°. 
Specific gravity = *9028. 
(G) l camphor in turpentine at 15° C. 
a D in a 1 decimetre tube = 16*52°. 
Specific gravity = *9030. 
It is evident from the above results that the solubilities of 
d and l camphoroximes and of d and l camphors in an optically 
active solvent are absolutely identical. 
A further confirmation of the result was obtained by crystallizing 
two inactive ( d + l ) mixtures from turpentine several times and 
examining the optical activity of the crystals. 
Mandelic acid and i - cam p h o r o x i rn e were found to be quite 
inactive after recrystallizing several times, so that the mixtures 
were not separated in this way. 
It will be observed that if the value of a D for the solvent be 
subtracted from that of the solutions of d and l compounds in 
the above cases the rotatory power found for the solute is not 
equal in magnitude and opposite in sign. 
Thus for example 
(3) d camphoroxime — 3*55° — 4*6° = — 8*15°, 
(4) l „ + 11*48° -4*6° = + 6*88°, 
and similar differences in the other cases. Since there is an equal 
quantity of solute of equal and opposite rotatory power in each 
case it is necessary to explain this anomaly. 
Solutions of the d and l isomerides of equal strength were made 
in the above solvents and their rotatory powers examined. 
