364 M. Jolly on Liquid Ammonia. 
formed, which appeared to have the formula €'* H'? Na Q?. 
Iodide of ethyle and chloride of acetyle act on this body, and 
form resinous bodies which could not be purified. 
Saligenine dissolves in baryta water, forming a crystalline com- 
pound, €’ H9 Ba 0? =€’ H’ Ba 0? + H? 0. 
By the action of pentasulphide of phosphorus, saligenine 
appears to become converted into an amorphous variety. 
The law which regulates the contraction of solutions made it 
probable that the specific gravity of liquid ammonia must be less 
than that found by Faraday; and with a view of testing this 
point, Jolly* has made a redetermination of its specific gravity. 
The liquid gas was prepared in the usual way, by heating am- 
moniacal chloride of silver in a bent closed tube, the empty end 
of which was much narrowed in one part and was provided with an 
arbitrary graduation. After the ammonia had been expelled from 
the ammoniacal chloride, and had been condensed in the cooled 
end of the tube, the part containing the liquefied gas was cooled 
down to a temperature of —86° in a mixture of solid carbonic 
acid and ether, and was melted off, which at this temperature 
could be done without danger. 
The tube was now immersed in pounded ice, and the height of 
the liquid read off. A subsequent weighing gave the weight of 
the tube, together with the hquid gas and the compressed gas 
above the liquid. 
The tube was now cooled down to —24° C., and the point 
softened, by which, as the tension of the gas at this temperature 
does not exceed two atmospheres, the gas escaped without danger 
or loss of glass. The opened tube was next transferred from the 
freezing mixture into pounded ice, upon which a violent ebullition 
commenced, after which, when terminated, and there was no more 
escape of NH3, the tube was closed and weighed, by which the 
weight of the vapour at O° was determined. 
At this stage special experiments were made to ascertain if the 
ammonia was anhydrous and quite free from air, which was found 
to be the case. The tube was next weighed empty, and then 
calibrated. 
From the data furnished by these various operations, Jolly 
found the specific gravity in three experiments to be 
0:6239, 0:6261, 0°61938, 
or in the mean 0°6231, which is one-sixth less than the number 
* Liebig’s Annalen, February 1861. 
