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tions of the drift and other positive indices confirm the correctness 

 of their identifications. 



It is infelicitous to call the promontory in the photograph the 

 Devil's Thumb. The author remarks in a footnote: "This is the 

 Devil's Thumb as given on the Danish and British Admiralty charts. 



Fig. 2. Devil's Thumb, S.E.^E. (True) S.S.W.>^W. (Mag=.) (Legend on British 



Admiralty Chart.) 



The real Devil's Thumb of the Arctic explorers is some forty or fifty 

 miles north of this" (p. 254). The true Devil's Thumb is, however, 

 sketched on the British Admiralty chart and the sketch there given is 

 herewith reproduced. It is topographically an object of a very dif- 

 ferent order from the promontory of the photograph. As it has been 

 cited in the articles in this Journal in its bearings upon the limita- 

 tions of glaci'ation, it seems unfortunate to introduce another Devil's 

 Thumb of so different a nature. Confusion has already arisen by rea- 

 son of this. An error in the location of the Devil's Thumb, in a 

 region where the charts are confessedly inaccurate, does not seem to 

 us to justify the transfer of the name to the false location. 



The author makes passing mention of the driftless area in the 

 Inglefield Gulf region, and although he declines to discuss it, as it was 

 not seen by him, he remarks in a footnote that "he cannot let this 

 opportunity pass without raising the query whether the topography in 

 the neighborhood of the Greenland driftless area is not such that an 

 area of this sort would naturally be expected. Was not the move- 

 ment of the ice outward and the main stream down the Inglefield 

 Gulf ? And is not the driftless area located in the place where the 

 high Red Cliff peninsula would naturally have clogged the ice and 

 hence prevented its action of erosion and notable transportation ?" 

 The driftless area is part of the same ancient peneplain as the summit 

 of the Red Cliff peninsula (Jour. Geol., pp. 205-206, Vol. Ill, 1895). 

 It lies on the east side of Red Cliff peninsula (see map on p. 668, Vol. II, 

 Jour. Geol.). It Xio.'s, between it and the great ue-cap. It is separated 

 from the peninsula by the valley of Bowdoin Bay about two miles 

 wide and 2000 feet deep. How an isolated part of a peneplain can 

 protect from glaciation another part of the same plain lying between 



