40 HENBY G. SMITH. 



an addendum to that publication. Since that work was 

 published the oils of many other species of Eucalyptus have 

 been obtained, some of which were from West Australia ; 

 these are included here also. 



In the Proceedings of the Royal Society of Victoria 1894, 

 page 195, Mr. W. Percy Wilkinson records the refractive 

 indices, and other data, of the oils of 18 species of Eucalyptus, 

 several specimens of some of the species being determined. 

 It is very probable, however, that a few were of doubtful 

 origin, as they were obtained from various sources. The 

 oil of JE. globulus, if true to name, should hardly give so 

 low a refractive index as there recorded with Nos. 36 

 and 46, which is almost that of eucalyptol itself ; nor, 

 should the oil be lsevo-rotatory to the extent of 6*2 degrees. 

 Again E. paucifiora (=F. coriacea) Nos. 28 and 60, con- 

 tained no phellandrene. The oils of species having the leaf 

 venation characteristic of E. paucifiora may reasonably be 

 expected to contain phellandrene, and not to be dextro- 

 rotatory to the extent recorded for No. 28. With un- 

 doubted species of Eucalyptus there is a marked agree- 

 ment in chemical results within certain limits, not only 

 with their oils but with their kinos. 



It was thought advisable to determine the refractive 

 indices, and the other necessary data, in the colder months 

 of the year, so as to secure the least variation in temper- 

 ature. During a large portion of the months of June and 

 July the temperature of the laboratory did not vary more 

 than half a degree from 16° O. either way. The specific 

 gravities were mostly taken at the same time as the refrac- 

 tive indices, but where that was not done the slight cor- 

 rection necessary for 16° O. was made. The solubilities in 

 70°/° alcohol were also taken when the room temperature 

 was at 16° 0. The alcohol had a specific gravity 0*8722 at 

 15*5° O. and the method adopted was to transfer 2 cc. of 



