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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. 
