of a Wax from China. 385 



Cerotic Acid from the Saponification of the Wax. 



The perfect washing out of the baryta salt from which the 

 cerotine has to be separated, is attended with considerable 

 difficulty. It is best effected by naphtha-alcohol or naphtha- 

 aether. The wax acid, after separation from the baryta salt, 

 is to be purified, first by long boiling with water in an open 

 vessel, to get rid of all traces of naphtha, and then by repeated 

 crystallization out of aether. In this way the melting-point 

 may be raised to 78°, 79° C. In appearance the acid perfectly 

 resembles the cerotic acid, with which it has also the same 

 melting-point. The substance, after long-repeated crystal- 

 lizations, was analysed. 



I. 0-2632 grm. gave 0-765 C0 2 and 0-3035 HO. 



II. 0-2631 grm. gave 0*7626 C0 2 and 0-3095 HO. 



III. 0-232 grm. gave 0*6695 C0 2 and 0*274- HO. 



These analyses give in parts per cent. — 



100-00 



I prepared the silver salt of this acid. 



I. 0*656 grm. of substance gave 0*1335 silver. 



II. 0-6635 grm. of substance gave 0*1355 silver, which gives 

 in 100 parts — 



I. II. 



Silver . . 20-35 20-4-2 



I. 0-4675 grm. of the salt gave 1-072 C0 2 and 0*431 HO. 



II. 0-4655 grm. of the salt gave 1*0767 C0 2 and 0*4295 

 HO, which give per cent. — 



I. II. 



Carbon 62-53 63*08 



Hydrogen .... 10-24 10*25 



Oxygen and silver . 27'23 26'67 



100-00 100-00 



