Chemistry and Physics. 267 
redistilled gives a liquid passing over between 145° and 150°, and pos- 
sessing all the physical and chemical properties of the etherial oil of 
ustard. The reaction is represented by the equation CeHsI+- 
Se=CeHsCy S2+KI.—Bull. de Petersburg quoted in Journal fur 
prakt, Chemie, No 8, 504, 1855. 
[Nor 
nds which i m 
Thus CeHslI distilled with a solution of KS should give CeHsS and 
KI. I will furthermore remark that the body having the constitution 
Ci2HiiI, and which may be called iodid of capronyl, must give by 
distillation with RS the oil of assafetida, which ina pure state appears 
to be simply C1218. 
Zinin’s researches have done so much toward completing the theory 
of the compound radicals of the acetyl type, that it is worth while to ex- 
amine in this place the parallelism which exists between the acetyl and 
ethyl series. ‘To do this we shall place the types of the two series in 
a tabular form. 
Ethyl, CsHs Acetyl, CiHs 
Ether, CsH;O Ac. oxyd, CsHs0 
Alcohol, CsHs0, HO Aldehyd,  CaHs0, HO 
Chlorid of ethyl, C4HsCl Chl. of ac. CsHsCl 
Acetate of ethyl, C1HsO,CsH2Os Acet. of ac. CsHs0, C4sHs0s 
Hydruret of ethyl,CzHs, _ Olefiant gas CaHsH, 
C4Hs CsHs 
Ethylamin, N H Acetylamin, N H 
H H 
Tersulphid of ethyl CsHsSs 
Anhydrous acetic acid CaH Os. 
Acetic acid C1404, and the oil of the Dutch chemists CsH«Cl2 
elements. The current passes from a point of gas-carbon through the 
fused chlorid to an iron wire as thick as a knitting needle. After a few 
seconds a small silver-white fused regulus forms and adheres to the 
wire gaining in a few minutes the size of a small pea. he mass is 
iron spoon, and withdrawing the s and 1] wire electrode together 
so that the metal shall remain covered with a varnish of the fused 
ant 2 
