202 Proceedings of the Royal Society of Victoria. 



causing the thermometer readings to rise quite steadily during a 

 fractionation. 



Of the oil number 1 in Table II., 250 c.c. were twice distilled 

 from calcium chloride to dry it, the end product being clear and 

 almost colourless, with a dark, strongly-smelling residue left in 

 the flask. The physical constants were slightly altered by 

 distillation, the values being 



Density 



Specific rotation 

 Refractive index 

 Sp. ref. energy 



•8484:i5°/i5° 

 [a], -85-4° 

 ... /xo 1-4769 

 •5637 



Of the distillate 200 c.c. during one complete fractionating in 

 the above apparatus gave the following fractions, of which the 

 physical constants were determined as before, except the density, 

 which was measured by a Westphal specific gravity balance; some 

 of the fractions were so small that the measurements could not be 

 conveniently made. 



Table V. 



These numbers show that a process of separation is going on, 

 as the density increases and the rotation varies with rising 

 boiling point. To see how far this separation could be carried, 

 the 11 individual fractions boiling between 155° and 195°C. were 



