110 PROCEEDINGS OF THE AMERICAN ACADEMY 



strong hydrochloric acid is much more stable than a solution, or the 

 wet salt. The substance is sparingly soluble in alcohol and essentially 

 insoluble in ether, benzol, or chloroform. 



If amnionic hydrate is added with caution to a concentrated solution 

 of the salt, a black jelly is precipitated ; if the solution is dilute, no 

 precipitate is formed, but the liquid takes on a pink color, which in a 

 few minutes passes through purple and violet blue to a yellowish green ; 

 from this solution hydrochloric acid precipitates black flocks, which 

 redissolve in an excess of the acid, or on the addition of amnionic hy- 

 drate. Sodic hydrate acts on the chloride in the same way. The free 

 base seems to be insoluble in ether; at any rate, nothing was extracted 

 by this solvent from an aqueous solution of the salt, to which an excess 

 of sodic hydrate had been added. It is evident from the observations 

 just described, that the isolation of the free base would be a matter of 

 great difficulty. 



The foregoing results correspond to those of Barr in every respect 

 except the crystalline form of the chloride, which he describes as white 

 needles as fine as hairs. He also made the pentacetyl compound 

 C 6 H(NHC. 2 H 3 0) 5 . 



Chlorplatinic acid with a solution of the trichloride of pentamido- 

 benzol gives no precipitate at first, but after some time a slimy brown 

 substance is deposited on the sides of the test-tube, evidently a product 

 of oxidation. We are inclined to think, however, that the oxidizing 

 agent is the oxygen of the air rather than the chlorplatinic acid, as a 

 similar result was obtained by the action of picric acid. Benzaldehyd 

 added to a solution of the salt also gave a tarry product. 



When the trichloride of pentamidobenzol is treated with nitric acid 

 and ferric chloride, a deep purple solution* is formed looking very 

 much like potassic permanganate, and when an excess of the ferric 

 chloride has been added, a brown flocculent precipitate is deposited, 

 which when dried forms a hard mass of a brown color without crystal- 

 line form, since under the microscope it appears to be made up of 

 sandy granules. It is slightly soluble in water, imparting to it a dark 

 brown color. Preliminary analyses 'gave the following results. 



0.1600 grm. of the substance on combustion gave 0.2592 grm. of car- 

 bonic dioxide and 0.0650 grm. of water. 



0.1685 grm. of the substance gave according to the method of Carius 

 0.0797 grm. of argentic chloride. 



* Compare this with the action of air on a solution of the salt or of the free 

 base described earlier in this paper. 



