from still farther north. In all cases our labels distin- 

 guish between the native rock and the boulders. Upon 

 returning home Prof. A. A. Wright and Mr. L^-nds Jones 

 set about a comparison of these with the large collection 

 of specimens of boulders from Ohio made by them and 

 our students. Already between fort3'and fifty close iden- 

 tifications have been determined, and the specimens 

 arranged side by side, open to the inspection of all. 

 The Smithsonian Institution of Washington was also, 

 at their request, furnished with a series of specimens 

 for the Columbian Expositon at Chicago, while an- 

 othe set was exhibited in the Ohio portion of the 

 Anthropological display in connection with their 

 exhibit illustrating the relation of man to the glacial 

 period. 



3d. The comparison of boulders with Canadian 

 fragments should be prosecuted along various lines, the 

 most important of which will be through microscopical 

 examination. This will enable us to interchange 

 specimens of small size, and thus greatly enlarge our 

 facilities for arriving at conclusions. 



One of the greatest difficulties will be to determine 

 the limitations of the outcrop of certain rocks in 

 Canada ; but until this can be done, little definite pro- 

 gress will have been made. For example, certain 

 Huronian conglomerates, especialh' a red jasper con- 

 glomerate is found widely scattered throughout the 

 States of Ohio, Michigan. Indiana, and Illinois, 

 specimens of it even reaching Kentucky. So far as 

 known, the outcrop of this species of rock is limited to 

 the area east of St. Mary's River, and west of Sudbury. 

 Still the distribution of boulders of it in the United 

 States would indicate either a wider area of outcrop in 

 the north or a more complex movement of ice than has 

 been suspected. Specimens have been found in boulders 

 as far east as Austinburgh, Ohio, by Mr. L. B. Garg. 

 They are reported also from Painesville, Chagrin 

 Falls, Cleveland, various places in Lorain Co., from 



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