GLACIAL PHENOMENA IN 
MAINE. 
T HREE or four years ago I began a series 
of papers in the “ Atlantic Monthly,” 
which, though they appeared as separate geo¬ 
logical sketches, had, nevertheless, a certain 
sequence. These contributions have been un¬ 
avoidably interrupted for more than two years; 
and, in taking up the thread again, my readers 
will excuse me if, by a rapid review of the 
subject then under discussion, I recall to them 
the point at which we parted. There were 
two sets of facts which first awakened the 
attention of geologists to the ancient exten¬ 
sion of glaciers, though at first no investigator 
connected them with the agency of ice. The 
first was the presence of boulders in Central 
Europe and England, which had their birth¬ 
place far to the north of their actual position ; 
the second was the presence of similar de¬ 
tached boulders scattered over the plain of 
