PREFACE. 
T HIS edition of the Geological Sketches 
offers nothing new to the public. Taken 
in connection with the former one, it only pre¬ 
sents in a permanent form and in their original 
sequence all the geological and glacial papers 
contributed by Professor Agassiz to the “ At¬ 
lantic Monthly ” during a number of years. 
The series must still be considered as unfin¬ 
ished, since his own hope of adding to it a 
complete account of his investigations on the 
drift phenomena of our coast and its outlying 
islands was not fulfilled. The material, in the 
shape of rough notes and sketches, had long 
been accumulated, awaiting for careful revision 
the quiet hour which never came. 
E. C. A. 
