18 



investigation, he has taken up the surface and glacial geology 

 of the United States, and has done considerable field work in 

 various regions for the purpose of getting facts which might 

 throw light on some of the extremely difficult and perplexing 

 problems presented in that field of investigation. The obser- 

 vations thus far made are of a nature to encourage a belief that, 

 with sufficient time and labor, some important results may be 

 reached in this direction. 



Cambridge, October 1, 1885. 



