and some of the Products of its decomposition. 109 



in considerable quantity during the preparation, was removed. 

 The substances employed in Nos. III. and IV. were made 

 with great care; merely traces of hydrobromic acid were 

 formed, which were also removed in the same manner. 



The combustions, which were all made with chromate of 

 lead, gave the following results : — 



, ! I. 0*3950 grm. of substance gave 0*5150 grm. of carbonic 

 acid and 0*1155 of water. 



II. 0*3095 grm. of substance gave 0*4085 grm. of carbonic 

 acid and 0*0920 grm. of water. 



III. 0*3650 grm. of substance gave 0*4085 grm. of carbonic 

 acid and 0*1047 grm. of water. 



IV. To determine the bromine, the substance was carefully 

 mixed with caustic lime and heated to redness in a combus- 

 tion-tube. The heated mass was then dissolved in nitric 

 acid, filtered, and precipitated by nitrate of silver. Treated 

 in this way there was obtained from 0*2668 grm. of substance 

 0*3805 grm. of bromide of silver. 



These numbers correspond per cent, to — 



I. IT. in. IV. 



Carbon . 35*85 35*99 36*23 

 Hydrogen 3*23 3*27 3*18 



Bromine . ... ... ... 59*83 



From which the following formula is deduced, 

 Cjg rdg Ijrg; 

 giving per cent, the following numbers : — 



1 6 equivts. Carbon = 1 200*00 36*85 



8 ... Hydrogen= 100*00 3*07 



2 ... Bromine =1956-61 60*06 



3256*61 100*00* 



Action of Chlorine on Sti/role. 



Chlorostyrole. — By the treatment with chlorine there is form- 

 ed a compound analogous to the bromostyrole. The chlorine 

 compound is fluid. It is extremely difficult to prepare the 

 chlorine compound pure. A stream of the gas passed through 

 styrole is rapidly absorbed, without any evolution of hydro- 

 chloric acid, if the current be not too rapid, and the tempe- 

 rature kept low, at the same time that the influence of the 

 direct rays of the sun be avoided. By long treatment the oil 

 changes into a thick fluid, which is chlorostyrole. As soon as 

 the evolution of hydrochloric acid indicates that no more sty- 

 role exists free, the action must be interrupted. The evolution 



* The loss of carbon in Nos. I. and II. arose evidently from a mixture of 

 another product richer in bromine. The evolution of hydrobromic acid in 

 the preparation can only take place from such a cause. 



