420 



Very many Eucalyptus oils, from authentic species, have now been under 

 observation for several years in the Museum, and we have thus been able to 

 determine in which of them this deposit has formed. 



Reference was made to it in the first edition of this work, but the evidence 

 then available was insufficient to enable general conclusions to be drawn. It may 

 now be stated that none of the oils of species belonging to the groups yielding 

 the more pronounced pinene oils, in which cineol is only present in small amount, 

 has any signs of the deposit appeared, nor in that of any member belonging to 



Plate LXXXVIII. 



Crude Oil of Eucalyptus goniocalyx. 

 Illustrating the deposit (A) and (B) the diminution in volume. 



the typical " Boxes," E. hemiphloia, &c, and closely agreeing Eucalypts. In 

 no species, the oil of which contains phellandrene, has it been detected, but is 

 most in evidence in oils distilled from Eucalypts belonging to the typical "Gum" 

 group : — E. globulus, E. goniocalyx, &c, and closely -related species. 



