THE MISCIBILITY TEST FOR EUCALYPTUS OILS. Lid 



Table I. 
A, Oil from #.australiana. B,82% Methyl Alcohol and 18% Water. 
Time after mixing. C.Sin: 
0 o4°8 CC. 
3°D hours 39°8 
24 a 39:0 
48 ae 43 
72 a 45°5 
144 * 54°5 


The change in O.S.T. must correspond to some molecular 
change in the solution, but we have not yet investigated 
this. It is probably due either to reaction between the 
cineol and the alcohol, or to condensation of the aldehyde 
present in the oil. 
The method used was somewhat similar to that of Orton 
and Jones (Jour. Chem. Soc. 1919, 115, 1055). In these 
experiments 1 c.c. of the oil, A, was mixed with 1 c.c. of 
the mixture of alcobol and water, B, inasmall tube about 
1 cm. in bore and 5—8 cm. long. The tube was drawn out 
somewhat at the open end, and fitted with a cap consisting 
of a piece of rubber tube and a piece of glass tube drawn 
out to a very small opening. This apparatus was then 
bound tightly by rubber bands toa thermometer, the liquid 
contents of the tube being placed exactly opposite the bulb 
of the thermometer. The thermometer and attachment 
were then placed in a large beaker containing water. The 
temperature was raised until the two layers of liquid mixed 
completely. The temperature (C.S.T.) at which a cloudiness 
developed on cooling was then noted. (The composition 
of the liquid B to be mixed with the oil should be chosen 
so that the C.S. Temperature is not too high, say not more 
than 60° C.; otherwise some of the constituents of B, such 
as alcobol, may be volatilised before the C.S.T. has been 
determined). 
