ESSENTIAL OIL AND SOLID CAMPHOR IN E. PIPERITA. 199 
The best crystals are obtained by saturating any substance that’ 
will absorb the oil, such as a porous tile, wood, etc., but as cork 
is perhaps less likely to contaminate the crystals, we have used 
that in preference. The crystals are well developed, acicular, and 
polarise light, extinguishing parallel to the principal axis, and so 
probably are rhombic. The crystals obtained upon a porous tile 
appeared to be free from adhering terpenes, and were found to 
have a melting point of 74—75° C.—each of four determinations 
being between those degrees of temperature. 
_ The greater part of the fraction distilling between 266-7° and 
272° C. comes over between 269-9 and 272° C. © Provisionally we 
state the melting and boiling points of this camphor at the tem- 
peratures given. We purpose naming the solid camphor from 
this oil ‘‘ Eudesmol,” in allusion to Robert Brown’s name for the 
genus Eucalyptus. 
In consideration of the fact, that the boiling point of this solid 
camphor is as high as 270 — 272° C., it will be seen that by any 
ordinary system of rectification this would remain with the residue 
and thus be removed from the bulk of the oil. 
The therapeutic value or otherwise of this camphor must be 
decided before this oil can be recommended for either external or 
internal use. One is inclined to regard it as a rubefacient in 
view of the fact that other solid camphors such as menthol and 
thymol derived from volatile oils are so used. 
(¢) PropaBLe THERAPEUTIC AND OTHER PROPERTIES OF THE Om. 
The result of our work so far on this oil is:— 
1. The yield of oil is good, being ‘784 per cent. an average of ae 
distillations on leaves with branchlets. 
2. Inthe crude state, owing to the presence of the camphor it 
may very possibly be an excellent rubefacient. 
3. The oil rectified below 190° C. is free from this stearoptene, and 
the fraction between 170° and 190° C. could, if required, be 
used internally, but as it contains phellandrene, and only 25% 
