500 PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
2. A depression of the continent, bringing the ocean into contact 
with the long Lp border, which, on its retreat, sends off icebergs 
d icerafts into the ocean. To these are attributed the further trans- 
portation of rered and boulder: 
. Emergence of the leapan — the higher beaches marking the 
earlier, and ae Champlain terraces the later stages of this process. 
“On the Geological pees of the Mastodon and Fossil Elephant 
of North America,” by P Ofensor — Hall, of Albany. Professor 
autum He 
‘tial deastevse position by the melting of a glacier. He considered 
the facts as evidence that the mastodon extended back to the close of 
the glacial epoch. The paper stimulated so lively a discussion that 
the time of the session was extended three-fourths of an hour, when & 
farther discussion was postponed till the next day. During the discus- 
Bad with foreign observations. He noticed that remains of cig 
a identical with the one found in Siberia, were numerous 1 
Russian America, and he suggested that the day might come when 
fossil ivory would become an important article of export from that 
territory. 
“ Considerations drawn from the Study of the Orthoptera of North 
America,” by S. H. Scudder, of Boston. This p gave a general 
account of the Orthopteran (grasshoppers, crickets, and the like), 
fauna of North America compared with that of Europe; showing = 
greater comparative richness of the American fauna under similar- 
climatic influences. It was followed by a more detailed notice of the 
groups which are characteristic of one continent in contrast WI with 
_ those forming the essential features in the fauna of the other. 
_ “On recent Geological Discoveries in the Acadian Provinces of Brit- 
ish America.” By J. W. Dawson, LL.D., F.R. S., Principal of a 
= ‘University. The object of the paper was to notice some rece 
 coveries, which, though of interest, might have escaped the notice of 
: = ore sp aaa 
