242 J. D. Dana on Glacier movements along valleys. 
circumstances the ice along the valley would have lost all mo- 
tion. The same condition of rest would have belonged to the 
and Win 
and Maine (94 pp. 4to), published in Volume I of the Memoirs of 
the Boston Society of Natural History (1867); also by Professor 
In the foregoing pages the facts from the State of Maine have 
Tred to. ese are well discussed by Dr. Packard 
in the memoir just referred to, in which he recognizes and ap- 
plies the principle discussed in this and the writer's former p* 
pers on the valley glaciers. He observes that of the eighty 
* In order to deduce the amount idenc river from 
the ay of the highest Sireceuee sas “apie eect it is neces 
i ive fo 
ait ; ctual ; height of the terrace 
Po amount of excavation that has taken place since the land 
V el; ] ss tl n th ount of elevation. 
Sr ER Abe Biier 
—e 
