318 BUNSEN ON THE CACODYL SERIES. 
ing ones in inorganic chemistry. 1 think therefore that the 
fact that this oxiodide cannot be reconverted into the iodide by 
digestion or distillation with hydroiodic acid, is one of these pe- 
culiarities. The powerful affinity existing between an oxide and 
haloid compound of the same organic radical, which this ex- 
ample presents, appears to me peculiarly adapted to support the 
views which Berzelius has published with regard to the consti- 
tution of those bodies obtained from alcohol by the substitution 
of chlorine, and suggests the possibility of forming these sub- 
stances by the direct combination of their proximate constitu- 
ents instead of the indirect method of substitution. 
I shall close this division of my subject by collecting below, 
in a tabular form, all those lower degrees of combination of caco- 
dyl which have been examined, and propose in the next to treat 
of the higher degrees of combination which possess so much in- 
terest in connexion with the former. 
C,H, As, = Kd Cacodyl. 
C,H, As,O =KdO0 Oxide of cacodyl. 
C,H,As,8 =KdS Sulphuret of cacodyl. 
C,H, As, Se = KdSe Seleniet of cacodyl. 
C, H, As, Cy = Kd Cy Cyanide of cacodyl. 
C, H, As, Cl = Kd Cl Chloride of cacodyl. 
C,H, As, ClO —KdCl4HO Hydrous chloride of 
cacodyl. 
C,H, As, I = KdI Iodide of cacodyl. 
C,H, As. Br = Kd Br Bromide of cacodyl. 
C, H, As, F =KdF Fluoride of cacodyl. 
Oxide of cacody] with 
= 2 
C, Hg As, O Hg,Cl, = Kd O + 2 Hg Cl + Gulag of mercury. 
Oxide of cacody] with 
= H y 
Pee agoee St, Kd 54 Bebe Ear of mercury. 
C,HgAs,ChO; =KdO+3 Kal 4 Basie chloride of ca: 
yi. 
C,H,As,BryO; =KdO+43KdBr A ae be of ca- 
odyl. 
C,H As,]y0;  =Kd0+43KdI? { Merri Ts 
yi. 
