vi LIFE OF THE PLEISTOCENE 



and 25301 to 25600 of the collections in the Chicago Academy of Sciences. A 

 duplicate set has been deposited in the museum of the University of Illinois 

 by the Academy and are numbered P 1 to 500. 



In a recent work, Salisbury 1 says of the Pleistocene record "The to-and-fro 

 movements of the land floras and faunas must have introduced an elaborate 

 series of superpositions, giving an elaborate, orderly, and unusual succession. 

 The record of this succession has not been worked out in its completeness, 

 and unfortunately there is little chance that it will be worked out in its fulness 

 unless by the most persistent care. " The present volume may be considered 

 a contribution to the end indicated by the above statement. It is fully ap- 

 preciated that it contains much that is incomplete and perhaps faulty. That 

 it is a first attempt to cover a wide and difficult field may in a measure explain 

 some of its shortcomings. It is thot that the bringing together of the widely 

 scattered data and literature relative to the subject will be found useful to all 

 students of the life of this last geological stage of the history of the earth. It 

 is confidently hoped that its publication will inspire a desire on the part of local 

 students to supply the deficiencies and to add the much-needed information 

 necessary before we can write a comprehensive account of the 'Life of the 

 Pleistocene.' 



1 Physical Geography of the Pleistocene, p. 273. 



