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been a Baltic one. This makes the author's opinion unexplainabie, the 

 more so as iny own researches of the last yeai-s especially into the 

 Groningen lloixlsnig have coin[)lc(ely confirmed this result. Though 

 the examination of the diluvial boidders of Groningen will at least 

 take (jne or two years more, yet I have got so far that I commu- 

 nicated part of the first results of my study at the JO^'' Physical 

 and Medical Congi-ess at Arnhem. I refer for this to the Proceedings 

 which will no doubt soon be published and only mention here that 

 the glacial flow which has created the GroJiingen diluvium originated 

 somewhere in North-Sweden, passed the Alands-islands through the 

 Gulf of Bothnia to the South and South-A'r^.s-^ and further reached 

 our country passing between Oesel and Gothland in the longitudinal 

 direction of the Baltic. About the question whether the direction 

 particularly derived as regards Groningen also applies to all the 

 other parts of the Hondsrug, I will pronounce no opinion as yet. 

 This must be examined more closely. Yet there is no denying the 

 prevailing Baltic character of the glacial flow. Such a glacial flow 

 then, would have to be supposed to be deviated about 90° through the 

 one coming from Scotland. Perhaps after this elucidation Dubois, too, 

 may abandon the supposition. Otherwise 1 should like to point out 

 that, — from a parallelogram with the directions of those glacial flows 

 being the conterminous sides and that of the Hondsrug the resultant, — 

 it appears that for such a deviation a force must be ascribed to the 

 Scotch flow much greater than that of the Baltic, a conclusion which 

 is diametrically opposed to fact. It is the Scandinavian land-ice which 

 has forced back the Scotch, Avitness the numerous Norwegian boulders 

 on England's east coast, and not the reverse. Nothing has ever been 

 heard about English erratics in the Netherlands. If I should find them 

 this year in the Texel, I hope to communicate this at once. Till 

 that moment this supposition is altogether unsupported and everything 

 argues against it. 



In the preceding pages I have made an attempt at refuting Dubois's 

 supposed deviating glacial flow. This seems first of all necessary to 

 me, because in case this conception is the right one a great number 

 of researches into our "Scandinavian diluvium" would become doubtful 

 and it would be advisable at once to begin a revision. B'ortunately 

 there is no reason for this yet. 



As regards the remaining contents of the discussed essay, I wish 

 to remark that I also ol)ject to looking upon the Hondsrug <^j!,s' a ?(;//oA^ 

 as being a terminal moraine by itself. It would carry me too far 



