]§ll Dr. E. Frankland on a New Series of 



tion, acidulated with nitric acid and precipitated by nitrate of 

 silver, yielded 1-8418 grm. iodide of silver. After precipitation 

 of the excess of nitrate of silver by hydrochloric acid, sulphu- 

 retted hydrogen was passed through the solution, and the slight 

 precipitate formed was washed, dried, ignited, and added to the 

 above peroxide of tin, in the weight of which it is included. 



II. 1-4254 grm., burnt with oxide of copper, 2 inches of 

 metallic copper being placed in front of the combustion-tube, 

 gave -5858 grm. carbonic acid and -2975 grm. water. 



III. 1-2209 grm. gave 0*5008 grm. carbonic acid and -2580 

 grm. water. 



IV. 2-0980 grms., treated as described in No. I., yielded 

 •9218 grm. of the body produced by the action of solution of 

 ammonia, which yielded -7239 grm. peroxide of tin. The am- 

 moniacal solution, precipitated by nitrate of silver as in No. I., 

 produced 2-2883 grms. iodide of silver. 



V. -9113 grm. gave -3735 grm. carbonic acid and '1908 grm. 

 water*. 



These numbers show that the crystalhne body is a compound 

 of one atom of sethyle, one atom of tin, and one atom of iodine. 

 The formula C'* H^ Sn I requires the following values : — 



100-00 



For reasons described below, I propose to call this compound 

 iodide of staruBthylium. 



Iodide of stanaethylium crystallizes in transparent, slightly 

 straw-coloured needles, which are right rectangular prisms, fre- 

 quently one-twelfth of an inch broad and 2 or 3 inches in length. 

 They arc very soluble in aether and in boiling alcohol ; less so in 

 cold alcohol and in water ; the watery solution is decomposed on 

 boiling, oxide of stanaethylium being precipitated and hydriodic 

 acid formed. Iodide of stansethyhum fuses at 42^ C, and boils 

 at 240° C, undergoing at the same time partial decomposition : 

 it possesses, at common temperatures, a peculiar pungent odour, 

 somewhat resembling the volatile oil of mustard, and which 

 irritates the eyes and lining membrane of the nose, causing a 

 discharge which continues for several hours or even days, espe- 



* The substance used in Noa. IV. and V. wasprotluced by the action of 

 light, that used in the other analyses by the agency of heat. 



