208 Proceedings of the Royal Society of Victoria. 



Table TX. 



It will be seen, that there is a wide range in the values of the 

 viscosity for the different oils and mixtures, from 148 for turpen- 

 tine to 303 for Cineol, moreover that a body like oil No. 13, 

 which according to its density and specific rotation must be 

 almost exclusively Terpene (Phellandrene), has the viscosity 154 

 near that of turpentine, while the oil No. 41, which according to 

 its density contains a large amount of Cineol, also has a large 

 viscosity, viz., 306, which indeed is too large for even pure 

 Cineol, so that probably small amounts of still more viscous 

 substances than Cineol are present. With only slight irregu- 

 larities the viscosity rises with increasing density. From the 

 densities the amount of Cineol in each oil or mixture can be 

 approximately calculated as already explained, and, as increasing 

 density means increasing content of Cineol, the viscosity rises 

 with increasing content of Cineol. 



It thus appears that conclusions drawn as to the composition 

 of an oil from its density and specific refractive energy could be 

 controlled in a general way by viscosity determinations. 



