70 



Scientific Proceedings, Royal Dublin Society. 



volume-temperature curves. Thus in the case of the " White Wax " at 56° 0. 

 on cooling, minute specks appeared in the bulb ; the corresponding point in the 

 graph is marked [aj. At 53"3° C, the point in the curve marked {b), a sudden 

 clouding of the whole mass took place, a granular structure being, however, 

 observable in the mass for some time after. On heating, the " White Wax " 

 showed signs of a granular structure a little above 50° 0. It was semi- 

 transparent at 54° 0. (c), and just clear at 55"2°C. [d). 



Change or Volume iin Fusion. 



1-225 



1-200 



1-175 



1-150 



1-125 



-100 



White. 

 Wax. 



Bees' 



h/AX. 



Fig. 2. 



In the case of the cooling of Bees' Wax, traces of a crystal-like deposit 

 appeared at the bottom of the wax at 63° C. {g). The deposit was dark, and 

 the general mass of the substance remained clear till 61-8° C. (A), when it 

 suddenly became clouded. On heating, the Bees' Wax became sensibly 

 translucent at 60-4° 0. («), and at 63-4'= C. (>) it was possible to read print 

 through the bulb. 



The " Mixture," on cooling, showed no signs of freezing till 57-5° 0. {e), at 

 which point a -.-^isp-like cloudiness suddenly appeared throughout the bulb. 



