DETERMINATION OF MELTING POINTS 227 



ranges of temperature may now be had from several different 

 optical firms. 1 



The Determination of Subliming Points may be made in the 

 hot stage illustrated in Figs. 121 and 122, or by the crucible 

 method of Blyth described on page 243. 



1 E. Leitz, Wetzlar, Germany, manufactures some especially convenient hot 

 stages. For other types of hot stage see Cram, J. Am. Chem. Soc., 34 (1912), 954; 

 and Cottrell, J. Am. Chem. Soc., 34 (1912), 1328. 



