72 Scientific Proceedings, Royal Dublin Society. 



The Lhermal expansion of tlie waxes in the liquid state was quite uniform 

 for the range studied ; but below the melting-point, the expansion of the 

 solid did not follow a linear law. The expansion of the solid below the 

 melting-point was very much greater than that of the liquid above it. 



The graph for the Mixture is very similar to that of its major component 

 the '• White "Wax." The lower limit of the fusion stage is practically the 

 same for the two. The upper limit is much below that of the Bees' Wax, and 

 only 3'5° 0. above that of the White Wax. Tlie Mixture seems to behave 

 as if the Bees' Wax were dissolved in the " White Wax." 



The metliod described in this communication, with slight modifications of 

 the apparatus, may be used for a varietj' of determinations, and would 

 probabl}' be found as accurate as, and much simpler than, some methods now 

 in use. The aj)paratus might obviously be made with short stem for the simple 

 determination of the density of a liqui<l at a definite temperature. As we 

 have seen, the method enables us to get exact values of the densities of solid 

 fats and waxes, and it seems more accurate for such purposes than those 

 usually employed in Organic Analysis.' It may be effectively used for the 

 determination of coefficients of tliermal expansion of liquids, and also of 

 solids, and would give the real and not the apparent expansion. Lastly, it 

 miglit be employed for delermining " Iransition points" in many cases where 

 the usual form of dilatometer is found ditficult to fill and troublesome to use. 



1 See Lewkowitscb, " Chemical Technology and Analysis of Oils, Fats, and Waxes," 1909, vol. i., 

 chap. V. 



