the Action of Ammonia on the Terbromide of Allyle. 261 



as shown in the following Table : — 



Theory. Experiment. 



I. II. III. 



28-93 29-22 29-17 

 380 3-34 3-86 



The specimens analysed were the products of different prepa- 

 rations, and the quantity employed in the last analysis was pre- 

 cipitated from its salt by ammonia. 



Dibromallylammonia is very sparingly soluble in water, but 

 completely soluble in alcohol, and in sulphuric, muriatic, nitric, 

 and acetic acids. Its taste is similar to that of the hydrochlo- 

 rate. It fumes when brought into contact with hydrochloric 

 acid, and behaves like an alkali towards litmus-paper. It is, 

 however, a weak base, being incapabk of precipitating copper or 

 silver from their salts. It does not appear to have any great 

 tendency to form crystallizable salts. The sulphate may be 

 readily prepared by dissolving the base in dilute sulphuric acid, 

 and removing the excess of acid by means of carbonate of baryta. 

 On filtering and evaporating the solution, a gummy mass is ob- 

 tained which has but little disposition to crystallize. Alcoholic 

 solutions of this base and of chloride of mercury give, when 

 mixed, an abundant white precipitate, which has probably a con- 

 stitution analogous to that of the double chloride and amide of 

 mercury, investigated by Sir Robert Kane. 



Action of Iodide of jEthyle on Dibromallylammonia, jEthyh- 

 dibromallylammonia. 



In order to confirm the formula of the new base, and to gain 

 additional insight into its constitution, I thought it desirable to 

 ascertain whether or not it contained another equivalent of hy- 

 drogen capable of being replaced by an organic radical. With 

 this view I resolved to try the action of iodide of Eethyle upon it. 

 The experiment was conducted in the following manner : — Two 

 grammes of the base were mixed with a large excess of iodide of 

 iCthylc, and the mixture was introduced into a long tube, which 

 was afterwards hermetically sealed. The base dissolved com- 

 pletely in the iodide ; on heating the tube, however, in a water- 

 bath, a thick oil, in which some crystals could be detected, soon 

 separated and fell to the bottom of the tube. After twenty 

 hours' heating, the tube was opened and the excess of iodide di- 

 stilled off as comi)letely as possible by means of a water-bath. 



