418 



Bromide . . . .C 6 H 17 N 3 Br 3 =^ ^A" 1 N 3 , 2HBr, 

 Iodide ...... C 6 H i7 N 3 1 2 =( C ^4)a ii I NSJ 2HI. 



The addition of free base to the solutions of the diacid salts still 

 further reduces the bromine and iodine. I have not, however, suc- 

 ceeded in obtaining the monacid compounds in a state of purity, but 

 the analysis of mixtures leaves but little doubt regarding the existence 

 of this class, and more especially of the compound 



CH 1=^) 



In addition to the above salts, the triatomic platinum-salt and gold- 

 salt have been submitted to analysis. The former salt contains 



C 6 H 18 N 3 Pt 3 0,= V 1 Ns Ui C i 3 , 3Pt C 1 2 . 



It is one of the finest compounds of the group, crystallizing, as it 

 does, in long golden-coloured needles. They are rather soluble in 

 water, so that the purity of the triethylenated base may be best 

 tested in the form of this platinum- salt, since the platinum -salts of 

 the ethylene-diamines, as well as of diethylene-triamine, with which 

 bases the second triamine is likely to be contaminated, are far less 

 soluble in water. The platinum-salt cannot be recrystallized without 

 suffering decompositions similar to those which alter the salt of the 

 diethylenated triamine. Left in contact with an excess of the 

 corresponding chloride, this platinum-salt undergoes a peculiar 

 metamorphosis. The slender needles, after the lapse of a day or two, 

 are found converted into well-formed prisms of considerable dimen- 

 sions, containing about 8 per cent, of platinum less than the original 

 compound. The salt appears to be the monatomic platinum-com- 

 pound, 



C 6 H 19 N 3 Pt C1 3 =( 2 * U N 3> H Cl, Pt C1 2 , 



although, owing to the transformations which the salt undergoes when 

 treated with water, I have never been able to obtain it in a state of 

 perfect purity. 



The gold-salt of triethylene-triamine crystallizes in yellow plates, 

 soluble in water, alcohol, and ether, which contain 



i 3 , 3AuCl 3 . 



