284 PROGRESS IN MICROSCOPY 



9. CHARACTERIZING AND IDENTIFYING FUSIBLE COMPOUNDS 



The Koflers have pubhshed tables showing the data of 1200 organic 

 compounds including melting point, temperature of eutectic point with 

 two reference substances and refractive index of the melted substances. 

 These numerical data are complemented with the description of many 

 properties recorded during the survey of the cojnpounds. These tables 

 are used to identify the fusible compounds by comparing the obser- 

 vations and measurements derived from fusion methods with the data 

 shown in the tables. The Kofler tables were gone over, in a very con- 

 venient form, by W. C. McCrone, in his work: "Fusion methods in 

 chemical microscopy". 



