ae hy 
Chemistry and Physics. 387 
gpd in the case of the bromid of ethylene by the equation 
C,H, Br,+4HI=C0,H,+2HBr+-4I,. 
In like manner di-iodhydrate of occa C,H,(2HI), and iodid of 
ethyl, C,H,1, yield hydruret of ethyl d free iodine. Iodid of ally] 
bs ields hydruret of Yee sonia to aie pasts 
H,I+-3HI—C,H, +21 
Todhydrie acid acts even upon perchlorinated ee Ms thus sesqui- 
chlorid of carbon, C,Cl,, reacts with it according to the equation 
c ,Cl,+12HI—C,H,+6HCI+6I,. 
All the sheared capable of paris directly with iodhydric acid, as 
for instance all the ethylenes and acetenes, C,,H,, and C,,H,- 9, first 
a0 4HI=C, H,+H,0,+2I 
iodid of ethyl being an bi mediate sioetind, ‘ oe manner glycerine 
yields Reig abs of propylen : 
Eth erived from the ond are first decomposed with formation 
of an odd of the radical and regeneration of the oxacid; the iodid and 
oxacid are then separately acted on by the excess of free jodhydric acid. 
Thus _Methyl-formic ether and iodhydric acid react according to 
equation 
C,H,(C,H,0,)-+2HI=C,0,4+C,H,+H,0 atl. 
Common dashed yields hydruret of ethylene mixed with hydroge 
and probably with some marsh-gas. Aeetone pe hydruret of propy- 
lene according . — equation 
«02 +4HI=C,H,+H, 0,-+2I,, 
but the Eee fo propylene undergoes a partial decomposition, proba- 
bly according to the equation 
C,H,+H,=C,H,+0,8 
Organic acids ceniad with iodhydrie acid are gs to formenes 
containing the same quantity of carbon as the acid, ge that these 
are sufficiently stable to resist a temperature of 275° Thus acetic 
acid reacts according to the equation 
C,H,0,+6HI=C,H,+2H,0,+3I,. 
Succinie acid, ike uty acid, yields hydruret of butylene; 
C,H,O geri H,,+4H,0,+61,. 
The author sas that the facts so ee above farkish a a general 
method of reproducing the roe eatery hydrocarbon of each series by 
en of all 8 bodies in the series. Thus hydruret ethylene, 
H,(H,), yi by replacement C,H,(Cl,), C “Hci O,H, 
(H,0,), © (0), and 0,H,(0,)(O,), in each the substitution being 
om 
