SYSTEM NAPHTHALENE-CHLOROBENZENE-PHEKOL, ETC. 5 



of ordinary alcoliol. After the alcohol had been removed, it was 

 dried in a vacuum desiccator over concentrated sulphuric acid. 

 Its melting point was 79.88°-79.89°. 



Calc. cblorido 



Calcium chloride 



Cone, sulph. acid. 



Fig. 1. 



Phenol in loose crystals obtained from Kahlbaum, was first 

 distilled, and then crystallised from petroleum-ether (b. p. ca. G0°), 

 from which it separated as fine pure white needles. It was 

 difficult to get rid of the petroleum-ether which adhered to the 

 crystals, because phenol is so hygroscopic that it can not be 

 handled on the suction filter. The apparatus shown in the 

 annexed diagram was therefore set up, and after two days of 

 suction in dry atmosphere with a slow but steady current of air, 

 the sample was placed in a desiccator over phosphoric pentoxide. 

 The melting point was not quite constant but fluctuated between 

 40.27° and 40.42°, perhaps on account of the different degrees 

 of humidity of the atmosphere and of the vessels at the time of 

 observation. 



Chlorobenzene, also from Kahlbaum, was sufficiently pure 

 without further treatment. On distillation the boiling point was 

 quite constant at 132.00°. 



