and some of the Prodmts of its decomposition. (J,^ 



pris'ms. Phosphorus is likewise sohible in hot slyrole, from 

 which it also crystallizes. Caoutchouc swells up by the aid 

 of heat in this substance; only a small portion however ,j^ 



dissolved. 



t;i.3. Composition ofStyrole. — We have already stated that on 

 the occasion of Simon's investigation, Marchand analysed 

 styrole. From his experiment it appears tiiat this body consists 

 of carbon and hydrogen, in the proportion of two of the 

 former to one of the latter*. We have also analysed styrole, 

 and our results confirm those of Marchand. ii'tb 



On combustion with oxide of copper, styrole prep^fje^jji^ 

 two different periods gave the following numbers:— j^.^^ -jiuijl 



I. 0'2722 grm. of styrole gave 09168 grm^j^f p^jrjjji^i^ijc j^^Ji^ 

 and 0' 1935 grm. of water. , ^y-, u,,., , 1 t,-,,,^ 



II. 0'464'Ogrm. of styrole gave 1*5745 grm. of carbonic 

 acid and 0"3290 grm. of water. 



Corresponding in the 100 parts to-tji5^ /nailL Jniofj'aVlJ oj: 



Carbon . . . 91-86 92-54 '; ''^^''^q 



Hydrogen . . 7-89 7*87 r' '^r ■ 



.CCtll 



Theory requires- 



Mean of exijer!tiie'nf£ ; 

 2 equivalents Carbonf = 150*0 92*30 92*20 ' 



1 ... Hydrogen = 12*5 7*70 7*88 ''K 



162*5 100-00 100*08 ^\ 



The above experiments leave no doubt as to the relative 

 amount of the carbon and hydrogen, but give no idea of the 

 absolute number of equivalents of the elements in the equi- 

 valent of styrole ; or, in other words, lead to no conclusion as 

 to the formula of the compound. This point it was however 

 very desirable to ascertain, as we already possess two bodies, 

 benzole and cinnamole, which have the same composition in 

 the hundred parts. 



The determination of a chemical formula for styrole was 

 attended with some difficulty. Like benzole and cinnamole, 

 this body formed no direct compounds, if we do not consider 

 here the products obtained by the action of chlorine and bro- 

 mine; in the case of the former substances, however, their 



* The volatile oil which Bonastre (.Journ. de Pharm., vol. xviii. p. 344) 

 obtained from the Copal balsam is certainly a totally different carbo-hy- 

 drogen from styrole. Henry and J. Plisson (same Journal, p. 451) found 

 its composition to be — Carbon = 89"25 

 Hydrogen = 10'46 

 Oxygen = 00-29 

 100* 

 This oil is also distinguished from styrole by becoming solid at 0° C. 

 t Carbon = 75. Hydrogen = 12-5. 



