282 
Found Caleulated for 
(middle) CHERS N; CH OMC EME ENS O1 
C 65: 20/, 65:29 63:75 
H HO 6:03 6:83 
N 18:47 , 19:08 15:94 
CI 8:83 „ 9:64 13:48 
99:58 „ 100:00 100:00 
The results do not correspond exactly to the calculated values, but 
there cannot be any doubt, that if haemopyrroline possesses the 
formula C, H,; N, the azocompound is composed according to the 
formula C,, Hs, N, Cl and not the formula C,, H,; N, Cl, viz. it is 
a disazocompound of haemopyrroline. 
An addition of caustie alkali to the aleoholie solution of the 
hydrochloride of haemopyrroline-disazo-dibenzene causes a consi- 
derable change in the coloration; the tint is now purer red. resem- 
bling the colour of oxyhaemoglobin. Water added to the alkaline 
solution preeipitates the colouring matter in the form of a very fine 
preeipitate and ether takes it up with a fine bright red colour. 
By evaporating the ethereal solution haemopyrroline-disazo-diben- 
zene is obtained in the form of a red lustrous amorphous body, 
easily soluble in alcohol, chloroform, benzene, petroleum ether and 
so forth. Its ethereal solution shaken up with diluted hydrochlorie 
acid yields brownish needles of the hydrochloride compound des- 
cribed above. By dissolving the azodye in boiling alcohol and ad- 
ding boiling water it may be obtained in the crystaline state but 
up to now we had not sufficient material to investigate it quan- 
titatively. 
As regards the constitution of haemopyrroline-disazo-dibenzene 
it might be expressed by the following formula: 
but we have so far no positive proofs that haemopyrroline is really 
methyl-propyl-pyrroline and not some other homoloque of pyrroline 
for instance diethyl-haemopyrroline or butylpyrroline; likewise 
there is no certainty that the alkylgroups oceupy the B-positions. 
