PROCEEDINGS OF SCIENTIFIC SOCIETIES. 623 
the primitive soil; the turf covered the heaps to the depth of six or 
seven inches, while there were no traces of soil below. The land- 
shells, such as Helix Book T mudtidentate, and others, remains 
of which were found in the lower portions o eaps, can only exist 
in hard-wood growths. The po Nir Se of the stand where these heaps 
occur is at present covered with large spruce growth. The ahog, 
found spe in these heaps, is extremely rare in Maine. Thus 
we have a change of vegetation, a change of certain species of ani- 
e k 
archeologists regarded similar heaps in Denmark as being older than 
the stone age — in fact, as among the earliest evidences of the sonar cic 
A short discussion ensued upon a probability that the a 
rested upon the primitive soil. dder 
Dr. Jackson spoke of the chemical means by which this 
could be brought about. 
Papers were read by Dr. H. Hagen, Mr. P. R. Uhler, and Mr. S. H. 
Scudder, on the Dragon-flies of the West Indies. 
LYCEUM or NATURAL History. New York, April 29, 1867. — Mr. 
north as Bahia, but which Professor Agassiz has claime i} 
on the Amazon. “Everywhere,” said the speaker, “the gneiss hills 
are rounded evenly down so as to present all the appearance of ‘roches 
moutonnées,’ and immediately over their surface, and clinging Ped 
vy 
never have been deposited by water, and where it is 
eet of oe kjee clay, very variable in 
thickness, such as would Groni from ical grinding Pe A 
the gneiss. This clay shows no pean of the sorting action o 
water, the felspathic This: broken quartz grains and mica ca -crystals 
