wel Nc OR SENT SN xrVE, 
TE nee eee Sea eS 
Gen. Totten on Disappearance of Ice in Northern Lakes. 359 
Camp Geol. Survey, 8. C., August 7, 1859. 
Ant. XXXIX.—On the Sudden Disappearance of the Ice of our 
Northern Lakes in the Spring; by Gen. J. G. Torran, Chief 
Engineer, U. S. 
(Read before the American Association for the Advancement of Science, held at 
Springfield, August, 1859.) 
This striking phenomenon has often given rise to wild : p 
lation and saeitobenis in the unscientific world. -It was the 
of dij 1 i : — 
ons, 
At the close of a day in A il, I think, the whole surface of 
e Champlain, with the exception of a very few “air holes 
