Derivatives of Tolidin. 491 
blue color with ferric chloride when concentrated, and green 
when dilute, when boiled this turns red and gives a precipi- 
tate of ferric hydrate. The sulphate is very insoluble; the 
hydro-chlorate is soluble in water and in alcohol ; it forms with 
Platinum chloride beautiful yellow acicular crystals, usually 
in rosettes, insoluble in water and dilute alcohol. These 
decompose on exposure to moist air, but if dried after pre- 
cipitation by washing with alcohol and ether, they may be 
further dried at 100° and analysed. The following results 
confirm the formula :— 
C; H; (CH;) NH, 
} 2HCl, PtCl, 
C; H; (CH;) NH, 
Caleulated. Found. 
T iD 
Platinum = 31.07 per cent. 30.81. 30.90. 
\ Cyanide of Tolidin. 
Cyanogen gas, evolved by heating mercuric cyanide, was 
slowly passed through a cold saturated alcoholic solution of 
Tolidin, till a distinct precipitate occurred, the solution was 
tightly corked and allowed to stand for forty-eight hours. 
A voluminous, brown, amorphous precipitate resulted 
which, when filtered and washed with alcohol, ether and 
benzol, was dried and examined, This product was found to 
be a reddish brown amorphous body, insoluble in water, 
alcohol, ether or benzol, very slightly soluble in phenol, 
ligroin and nito benzol. It did not melt at 320°, and burned 
with difficulty when heated on platinum. It decomposed 
into tolidin and oxalic acid when heated with acids. 
In making the combustion of this substance it was found 
necessary to add lead chromate to the copper oxide to ensure 
complete oxidation, and even then the combustion was very 
tedious, The following figures established the formula :— 
Cy He Ne 24 CG H; (CH;) NH, | CN 
Theory. Found, 
10 Il. TET: 
C = 72.72 71.96 71.8 
H = 6.06 6.11 6.21 
N == 21.21 see eeee 21.43 
