causes the rising branch to maintain itself here so much longer than 
in the experiment described previously. We may, meanwhile, conclude 
that notwithstanding the acetic acid present, 5, present in large con- 
centration, rapidly reverts to 5;, a conclusion that bad already been 
drawn in my fourth communication; for the explanation of the 
experiments it is not to be neglected because it is thus shown that 
the S, concentration has already considerably receded at the moment 
that the rise observed by pr Leeuw commenced. Secondly, the rise 
in this experiment appeared to occur only once, and not to repeat 
itself either at 84°.8 or at 93°.0. 
Much more important are the following conclusions: The rise has 
no connection with the conversion S‚nZ2Smon-. If, at the lower 
temperatures, monoclinic sulphur had formed it would have been 
impossible to realise a retardation of the said conversion above the 
highest transition temperature. The tables I] G and H, however, 
clearly prove the possibility thereof. Even at 98°.6, 40 minutes after 
this temperature had been attained, the conversion had yet to start; 
once started it was, of course, very evident, also still at a tempera- 
ture of 96°.4 (Table II J) whereas when wnintroduced it had not 
appeared at 96°.2 (Table II G). 
The fourth conclusion is derived from Table IL K, namely, that 
at 95°.8, the reaction Sine Smon stops in the presence of some 
percent of S,, just as was shown by the investigations communi- 
cated in my fourth paper, again in conflict with the communications 
criticised here. 
If one should opine that the phenomena are fundamentally different 
owing to the use of acetic acid as dilatometer liquid, it may be 
communicated here that I have also carried out the experiments 
with turpentine-carbon disulphide. There it appeared, as might have 
been expected, that the first maximum appears in a less pronounced 
manner and also that, on using that liquid, subsequent risings at 
higher temperatures do not take place; in fact no fundamental dif- 
ference occurs. 
The above investigations had therefore demonstrated that the 
explanation of the dilatometer behaviour at temperatures of 70°— 80° 
by the conversion Sn S Son failed utterly. Also as regards the con- 
version S,—S,, I had my doubts as to whether this sufficiently 
explains the fall after the maximum has been attained. This was 
corroborated by the following experiment. Sulphur was heated to 
boiling in a dilatometer vessel, gaseous ammonia was passed for a 
few minutes, then it was chilled and not until after three days 
acetic acid was introduced. 
