685 
cold water, and then the solid substance obtained by evaporation 
is recrystallised. 
BCS) 
z 
NHCNS 
According to Finprar’s ') experiments, and also according to ours 
the internal liquid equilibrium that sets in when ammonium sulpho- 
cyanate is heated up to 160° for some time, has the following compo- 
sition 75°/, NH, CNS and 25°/, CS (NH,),. When the liquid is poured 
into cold water, this state is fixed. If we suppose that everything 
is solved at 25°, the obtained state lies in our figure on the line 
that joius the points P and A, and in the unsaturate region. If we 
now begin to make the liquid evaporate, the isotherm of the com- 
pound NH,CNS.4CS(NH,), will be passed, i.e. we may enter the 
region which is supersaturate of the compound 1,4 indicated by the 
point V, so that the latter deposits. If we now separate the solid 
substance from the mother liquor and if we solve the compound V 
in a new quantity of water, the obtained liquid will again lie in 
the unsaturate region, but now on the line that connects point V 
with A. This joining line accidentally does not cut the isotherm of 
the compound V, but that of the thioureum (5), so that on evapo- 
ration of the solution, not the compound V, but thioureum will 
1) Journal Chem. Soc. 85, 403 (1904). 
