( 102) 
at a somewhat later time. Small variations in the direction or in 
the velocity of the motion of the ice can easily have divided the 
boulderclay in strips and patches. 
Thus all the observed geologieal phenomena can be viewed in the 
light of known actual phenomena, which appears to be impossible if 
we start from the opinions embraced up till now on the nature of 
the Hondsrug. 
Now that it is known that the direction of ice streams which ended 
in North-Germany has often been considerably modified by the 
form of the basin of the Baltic and also by the meeting with other 
ice streams, it is less surprising, that, notwithstanding the predominating 
or exclusive occurrence of Swedish, at least Scandinavian rock 
species in the bottom-moraine of our north-eastern provinces, these 
can nevertheless have arrived there in north-west—south-eastern 
direction. Suchlike factors, as supposed to have modified the di- 
rection of the North-German ice streams, may have been the cause 
of the deviations of an ice stream, which, coming from Sweden, first 
took a south-western direction over Denmark, till it arrived in the 
North-Sea. We do not know how far the ice which came down 
from southern Scotland and northern England did progress south- 
eastward in the North-Sea; it might be possible, at least, that as a 
very powerful stream it has met there with the ice stream coming 
from Sweden and has pushed this back south-eastward in the direction 
of Friesland, Groninghen and Drenthe. 
Very likely as a result of this motion of the ice over our north- 
astern provinces the Hondsrug and some parallel less extended 
elevations have then arisen, in such a way as indicated above. 
Farther west of the Hondsrug, however, probably a real folding, 
under the pushing ice, of strata impermeable for water, should they 
consist in Potclay or in the boulder-clay itself, raised, perpendicular 
to that direction, a number of north-east—south-western ridges, leaving 
between them valleys now occupied by rivulets. Indeed an elevation 
by folding is more readily to be admitted for compact soils than for 
the loose sand which constitutes the nucleus of the Hondsrug. 
Geology. — “The Geological Structure of the Hondsrug in Drenthe 
and the Origin of that Ridge.” Second communication. By 
Prof. Eve. Dusots. (Communicated by Prof. BaKavis RoozeBoom). 
Further researches in that part of the Hondsrug, considered in my 
former communication, led to the following results. 
At a short distance north-east of pit LI, the boulder-sand bed of 
