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Gilbert, G. K. Continental Problems. Roch- 

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Hague, Arnold. Geology of the Eureka Dis- 

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Henderson, C. Hanford. The Cretaceous Fold 

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Hogg, Prof. Alex., Fort Worth, Texas. The 

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Pilling, James Constantine. Bibliography of 

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Pohlman, Julius, M. D. Duration of Life bf 

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Pope, Albert A. Memorial to Congress on the 

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Raymon, George Lansing. Genesis of Art- 

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Scott, Sir Walter. Marmion. American Book 

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Sherwood, Sidney. The History and Theory 

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Shufeldt, R. W. On the Classification of the 

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Stebbins, Genevieve. Dynamic Breathing and 

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Trumbull, General M. M. Earl Grey on Reci- 

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Willink, Arthur. The World of the Unseen. 

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POPULAR MISCELLANY, 



Number of Glacial Periods. An article 

 by Prof. George F. Wright, in the American, 

 Journal of Science, is devoted chiefly to show- 

 ing that certain points of evidence relied 

 upon by those who believe that the " Glacial 

 epoch" consisted of two periods of glacia- 

 tion of similar extent separated by a long 

 interglacial epoch, are insufficient to afford a 

 basis for such a conclusion. Furthermore, 

 the author adds to this : " As bearing against 

 the duality of the Glacial period, it may be 

 urged with great force that it is improbable 

 that two periods should so nearly duplicate 

 one another as these two are supposed to 

 have done. To those who maintain the suf- 

 ficiency of Croll's astronomical cause, how- 

 ever, this is rather an argument in favor. 

 But, on the other hand, that cause would 

 also demand a long succession of periods 

 during all the geological ages, and of these 

 we lack sufficient proof; while it would 

 throw the two periods which Prof. Chamber- 

 lin recognizes back much farther than the 

 facts will admit. It must be said, however, 

 that it is not wholly out of analogy with 

 known earth movements to suppose that 



