I [NG8 OP Till: A.M1.R1' AN ACADEMY. 



ine through the solution in which the red body 

 and Amort obtain a Mack precipitate to which 

 rmula A iHg 8 , and this derives support from there- 

 I iodides described by these authors in a succeeding 

 ' ! The in tion is given somewhal more fully in a later 



theil. 16 On partial precipitation of a mercuric chloride 

 a yellow body was obtained, to which, from a sii 

 : lently impure substance, the formula AsH 9 HgCl 

 !'■ im this experimenl and from the results of Prance 

 f Lol "i. Partheil considers that there should be added to the 

 t&d above a third, with the structure 



-II 

 As- II 

 - IlgCl 



While the evidence appears to show that the hydrogen of arsine is 



replaced by the mercurous chloride group to a greater or less extent, 



tlit> formula for the red substance does not seem to as to have hecn 



clusively proved, and the reactions of decomposition are decidedly 



in doubt Nothing has been brought forward to show definitely the 



i < if the yellow compound or compounds, if such exist, to the red. 



L ck of tii rents as at present from studying the reaction quanti- 



, but it is hoped that the investigation may be taken up later by 



us. Nevertheless the following qualitative reactions have made 



it ] it the bands of color so that they may be kept for a 



ime, either in their original form or by means of a 



and fixation. 



The removal of the relatively large excess of mercuri ide from 



paper by treatment with absolute ether or alcohol did not oiler a 



ition of the difficulty, as the colors faded rapidly even when kept in 



dark and over sulphuric acid. The color is quickly bleached by 



boiling with v, is well known. Cold water acts more slowly, the 



r not being completely changed until after a day or two, and then 



iched, but converted to a dull gray. Bird, 10 and also Goode 



I Perkin, 17 have observed the action of hydrochloric acid upon the 



original col t, which is thereby considerably changed. Goode and 



Perkin al io note the ad ion of ammonia upon the original color, but do 



rind the action of service in preparing standards. 



Prom the evident effect of even a Blight amount of moisture we were 



" [bid., 31, 596 (18 10 Archiv. d. I'liarm., 237. 121 (1809). 



16 Loc cit. it Loc cit. 



