166 Dr. E. Frankland on a New Series of 



of stansethylium is deposited in long white needles, which closely 

 resemble, both in appearance and properties, the chloride of stan- 

 ffithylium. These crystals, pressed between folds of bibulous 

 paper, and dried over sulphuric acid in vacuo, gave the following 

 analytical results : — 



•9730 grm., burnt with oxide of copper, yielded -5108 grm. 

 carbonic acid and '2582 grm. water. 



These numbers agree very closely with the formula C'^H^SnBr, 

 as is seen from the following comparison : — 



Carbon . 

 Hydrogen 

 Tin . . 

 Bromine . 



These results show that stansethylium perfectly resembles 

 cacodyle in its , reactions, combining directly with the electro- 

 negative elements and regenerating the compounds from which 

 it has been derived. 



Examination of Gases. — The examination of the gases evolved 

 on opening the tubes in which iodide of sethyle and tin had been 

 submitted to the action of heat, and which were allowed to stand 

 over sulphuretted water for twelve hours, yielded the following 

 results. Specific gravity : — 



Weight of flask filled with gas . . 35-4712 grms. 



Temperature of room 20°-8 C. 



Height of barometer 761-2 mm. 



Height of internal column of mercury 15-2 mm. 

 Temperature in balance case . . . 22°* 6 C. 

 Weight of flask filled with dry air . 05-4703 grms. 

 Temperature in balance case . . . 22°* 8 C. 

 Capacity of flask 140-50 cubic centims. 



From these data the specific gravity was calculated to be 1*0384. 

 The remainder of the gas was submitted to eudiometrical 

 analysis : the following numbers were obtained : — 



I. In Short Eudiometer. 



Difference Correctedvol. 



Observed of mercury at 0° C . and 1 



volume. Temp. level. Barom. metre press. 



^"J^J^f KM usedj 143.4 3f.oc. 17.3 7SS5 99-09 

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