420 
DR. E. FRANKLAND ON A NEW SERIES OF 
requires the following values : — 
Calculated. 
c, ... . 
24 
11-18 
u, ... . 
5 
2-33 
Sn . . . . 
58-82 
27'40 
I .... 
126-84 
59-09 
100-00 
Found. 
A 
II. 
11-21 
III. 
11-19 
IV. 
■i 
V. 
11-18 
2-32 
2-35 
2-33 
27*18 
27-12 
59-21 
o8-76 
For reasons described below, I propose to call this compound iodide of stanethy Hum. 
Iodide of stanethylium crystallizes in transparent, slightly straw-coloured needles, 
which are right rectangular prisms, frequently one-twelfth of an inch broad and 2 or 
3 inches in length. They are very soluble in ether and in boiling alcohol ; less so 
in cold alcohol and in water; the watery solution is decomposed on boiling, oxide of 
stanethylium being precipitated and hydriodic acid formed. Iodide of stanethj'lium 
fuses at 42° C., and boils at 240° C., undergoing at the same time partial decompo- 
sition : it possesses, at common temperatures, a peculiar pungent odour, somewhat 
resembling the volatile oil of mustard, and which irritates the eyes and lining mem- 
brane of the nose, causing a discharge which continues for several hours or even days, 
especially if the vapour from the heated iodide of stanethylium be inhaled ; yet this com- 
pound can scarcely be said to be volatile at common temperatures, since a few grains 
may be exposed to the air for several weeks without any appreciable loss of weight. 
Oxide of Stanethylium. 
In contact with solutions of the alkalies, iodide of stanethylium is immediately de- 
composed, oxide of stanethylium and an alkaline iodide being formed ; with solutions 
of potash and soda the oxide of stanethylium dissolves in an excess of the precipitant, 
but is reprecipitated, unchanged, by cautious neutralization of the alkaline solution ; 
with solution of ammonia the precipitated oxide remains undissolved on the addition 
of an excess of the alkali ; a quantity of the oxide of stanethylium, prepared in this 
latter manner, was heated for a few minutes with an excess of ammonia, thrown on 
a filter and washed with distilled water until all iodide of ammonium was removed. 
Submitted to analysis it yielded the following results : — 
I. ’3497 grm., burnt with oxide of copper, gave *3218 grin, carbonic acid and 
T 630 grin, water. 
II. *7296 grm., decomposed by nitric acid and ignited, gave ’5778 grin, peroxide 
of tin. 
III. *9218 grm. gave, when similarly treated, 7239 grm. peroxide of tin. 
These numbers agree closely with the formula — 
C 4 H 5 SnO, 
