Eucalyptns-Oih of Victoria. 



199 



First, as regards density, it will be noticed that it ranges from 

 •853 to -965, and if the last live oils, Nos. 83-87 (on account of 

 probable alteration with age) and the two preceding Eucalyptols 

 are omitted, the range is from -8532 to -9327, which is not incon- 

 siderable. Separating out the numbers of oils whose densities lie 

 within the ranjjes -85 to -86, -86 to -87, and so on, we get 



Table III. 



The first point to notice in this last table is, that up to a 

 density of -91 the numbers of oils are fairly evenly distributed 

 through the successive intervals of •Ol in density, while at the 

 two higher intervals from ^91 to ^92 and -92 to ^93 the numbers 

 increase markedly ; 35 oils have their density between '85 and 

 •91, while 24 have a density between ^91 and -92, and 19 between 

 •92 and -93, so that there is a tendency towards a classification of 

 the oils by density. 



Second, as regards specific rotation, it may be stated that on 

 the whole a progressive alteration of the specific rotation 

 accompanies the alterations of density, the lightest oils having 

 the greatest Isevo-rotation, which diminishes with increasing- 

 density to at about a density of •907, after which with a feu- 

 exceptions the oils are slightly dextro-rotatory. 



Third, as to refractive index, the alteration here is also 

 progressive, the lighter oils having the higher index, whicii 

 diminishes with increasing density except in the last few oils, 

 which are altogether exceptional ; but the specific refractive 

 energy is much the better form in which to study the i-elations 

 of the oil to light, aiid the specific refractive energies of the oils 

 show a range of variation which is larger than that of the 

 density, the values progressing from about -56 to ^49 (diminishing 

 with increasing density). 



Fourth, as to the Phellandrene reaction, it will be seen from 

 the table that all the oils which give the Phellandrene I'eaction 



