276 R. T. BAKER AND H. G. SMITH. 
ation with the oil of Z. punctata was 46-4 per cent. As the 
sample of Z. globulus was a commercial one, it was of course 
obtained from several trees. The eucalyptol present in the crude 
oil of the nine samples in the table, obtained by adding together 
equal volumes of each, was 55°112 per cent., or five per cent. 
better than the sample of Z#. globulus. The calculations were 
made according to the formula C,,H,,0, H;PO,. 
6. The colour of the oils.—The oil which was found to be only 
slightly dextro-rotatory, came over at the original distillation 
darker in colour than that which was more dextro-rotatory, this 
being but slightly coloured ; but the oil which was the most levo- 
rotatory was the darkest of any of those obtained. None of the 
oils however were very dark, the darkest being about the colour 
of pale ale, and it was possible to easily take their readings in a 
polarimeter with a 200 mm. tube. We were very much concerned 
at first at obtaining these different coloured oils, as it appeared to 
us unaccountable, as no matter what the pressure of steam, the 
results were the same with the same oil. It is hardly possible, 
therefore, to obtain a colourless oil from mixed leaves of 2. punctata 
when distilled commercially by steam, although it may be obtained 
but slightly coloured from some trees, but this is no defect, as all 
oils should be rectified before being used medicinally, and the 
colour remains with the residue, the first two fractions being 
almost “ water white.” 
We think the colour in some of these oils may be accounted for 
by the presence of two substances boiling between the tempera- 
tures 219 and 261° C., and it appears probable that one of these, 
most likely the larger portion, other than the aldehyde, is derived 
from the alteration of the dextro-rotatory terpene, as this appears 
hardly to exist in the darker oils. 
The residues of the several distillations boiling above 193° C. 
were collected, and 50 cc. taken for further distillation ; only @ 
few drops were obtained below 219° C., (these were removed). 
Between this and 240° C. } cc. was obtained. 
