683 
In conclusion we will still remark here that the system ¢ristearin, 
which according to our investigation exhibits the phenomenon of 
allotropy, and is probably monotropic, has also furnished a confir- 
mation for the theory of allotropy, as it has appeared here again 
that the solid phases are states of internal equilibrium. Particularly 
for the metastable modification it could be clearly demonstrated that 
the solid substance which has assumed equilibrintm at lower tempe- 
rature, melted already below the metastable unary melting-point in 
case of rapid heating. 
Henze it follows from what preceues that we have to assume two 
kinds of molecules « and 3 for the systera tristearin, and that the 
differences between the two erystallised states are owing to the ditfe- 
rence in situatton of the internal equilibria. 
That the phenomenon of double melting observed for other fats, 
will have. to be accounted for in the same way, is more than probable. 
Anorg. Chem. Laboratory of the University. 
Amsterdam, Oct. 25. 
Chemistry. — “On the system ammonium sulphocyanate-thioureum- 
water.’ By Prof. A. Smits and A. Kerrner. (Communicated 
by Prof. A. F. HorrLEMAN). 
(Communicated in the meeting of October 26, 1912). 
A recently published paper by Atkins and WEeRNER*) induces us 
briefly to communicate already now the results of an investigation 
which is not yet quite completed. 
The pseudo binary system NH,CNS — CS (NH), was examined. 
The melting-point figure found for this system (fig. 1) pointed with 
great probability, to the existence of a compound NH,CNS . 4 CS (NH), 
because the curves of cooling on the right of this concentration did 
not give a single indication for a eutectic point at + 105°, whereas 
this was the case for mixtures on the leftside uf this concentration. 
Atkins and Werner are, however of opinion that the compound 
NH, CNS.3CS(NH,), follows from the melting-point lines found by 
them, which show a close resemblance to ours ’). 
To get perfect certainty about the existence of the compound 1 4, 
1) Journ. Ghem. Soc 101, 1167 (1912). 
2) On account of the rapid conversion of CS (NH), at high temperature, the 
mixtures with more than 70°/) CS (NH had to be investigated by Socn’s capil- 
lary method, 
