( 141 ) 
then continually under the pressure of the saturated vapour, so that 
we reach the point S along the line KS .?) 
3. The cooling has not been continued sufficiently long. For in 
cases as in fig. 9 the triple point S lies mostly at very low tem¬ 
peratures. Then, of course, only the cooling must be continued. 
It is however to be feared then, that the case d occurs before the 
line SM is reached. 
4. There is no crystallized state (fig. 10 and 11). Then we may 
wait very long before the amorphous glassy mass crystallizes. 
{To be continued). 
Geology. — “On oceanic deep-sea deposits of Central-Borneo”. By 
Prof. G. A. F. Molengraaff. 
In the year 1894 I discovered in the basin of the Upper Kapoewas 
in Western Borneo 2 ) cherts and hornstones, consisting almost entirely 
of tests of Radiolaria, which I described as deep-sea deposits. Such 
rocks are also known as Radiolarite. 
The Radiolaria from these deposits were examined by Hinde 8 ) 
and in consequence the age of these rocks was determined as pre- 
cretaceous, probably as Jurassic. 
The formation, of which these Radiolarites form part, I named 
the Danau-formation, after the large danaus or lakes of Western 
Borneo, where this formation is well-developed and was first observed 
by me. The Danau-formation there occupies a strip of country of an 
average breadth of 60—70 K.M. which is bordered o i the north side 
by older formations, namely of the old-slate-formation, while on the 
south side it disappears under younger tertiary sandstones and volcanic 
products. The whole formation is strongly folded with an east-west 
strike, and forms part of the Upper Kapoe was mountain range. 
From the lake district I could follow this formation eastward as 
far as the watershed between the Upper Kapoewas and the Upper 
‘) Might it not be possible to try to make some of the many substances men¬ 
tioned to me by Mr. Jaeger crystallise as e. g. several esters of organic acids, 
amber-acid*nitril, and others? 
*) G. A. F. Molengraaff. Geological explorations in Central Borneo, p p 123 & 414 
Leiden 1902. ; 
3 ) G. J. Hinde, ibidem, Appendix I. 
