( 98 ) 



has flowed in the hnfjitudmal direction of tlie Hondsriig over onr 

 Nortlierii provinces. In accordance willi this was the nintnal sliding 

 of the parts of a split bonlder of quartzite observed by Dubois. 



That is all. To preclude all misunderstanding I shall quote the 

 following passage (p. 100) : 



'The situation of the elevated ridge of pregiacial sand side by 

 side with the long and broad western ^) strip of boulder-clay makes 

 us also suppose that the direction in wliich the ice moved was not, 

 as is still generally admitted, from north-east to south-west or from 

 north to south "'), but the same as the extension of the Hondsrug, 

 from north-west to south-east. Now with this sup|)Osition perfectly 

 ag]-ees the at first sight paradoxical direction of motion as derived 

 from the shifted boulder of quartzite." 



After stating this hypothesis the authoi- attempts to explain his 

 observations more in particular by this. I need not enter into these 

 explanations. Be it only said that he tries to support his hypothetical 

 direction of the ice-flow by a second supposition about the possibility 

 of the foi'cing back of the Scandinavian glacial flow by one coming 

 from Scotland in the following words (p. 101) : 



"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 Scandi- 

 navian °) rock species in the bottom-moraine of our north-eastern 

 provinces, these can nevertheless have ari'ived there in north-west- 

 south-eastern direction. Suchlike factors, as supposed to have modified 

 the direction 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 [)rogiess south- 

 eastward in the North-Sea; it might be possible, at least, that as a 



1) The English text is here not perfectly corresponding willi llie Diitcli (p. 19) ; 

 see for this the note on p. 99. 



~) I do not know wlio ascribes tlie diluvium of our Norlliern provinces to a 

 glacial flow directed from North to South. 



=') This addition again suggests that the author may think of a\"or?(?(/7/ as the place 

 of origin. Besides the greater part of the boulders in the ground-moraine of the. 

 Hondsriig is less of Swedish Ihan of Dol/ir origin. More about this (|ueslion 

 below. 



*) The italics are mine. 



