356 SCOLOPENDRIUM OFFICINARUM IN WESTERN NEW YORK. 
sent community of species in Europe and America was brought about 
during the glacial age, as we have seen that it could not have occurred 
after that period, so it could not have occurred before it. 
I have already referred to the recent papers of Mr. Croll in elucida- 
tion of Sir John Herschel’s theory of the causes of the great changes 
of climate during the glacial age. I have also referred to the geo- 
logical evidences of breaks in the glacial age. Here accordingly in 
this community of species we have another proof that the glacial age 
had one or more breaks, consisting of very considerable elevation of 
temperature, when the land rose, and there was a highway between 
Europe and America by way of Iceland and Greenland. Trees and 
higher forms of vegetable life grew freely along the highway, so that 
the temperature must have been of a very considerable mean. It was 
not high enough to admit any of the plants of the meridional region, 
for we find no community of species in the southern forms of Europe 
and America; but plants of the Regio Septentrionalis and Regio 
Intermedia freely passed over it. 
SCOLOPENDRIUM OFFICINARUM IN WESTERN NEW 
: PROBABLE DETERMINATION OF THE ORI- 
GINAL LOCALITY OF PURSH. 
By J, A. PAINE, Jun. 
At the request of Dr. Gray, a trip to the hills of South Herkimer 
county for rare Orchids, was lately extended to Onondaga county, for 
the identification, if possible, of the habitat of this Fern, so rare with 
us, which Pursh discovered and recorded. The ravine of Chittenango 
Creek is too far east by twenty miles or more to be referred to his re- 
mark. Jamesville, therefore, was visited, to find out how far this new 
station is from Onondaga, and if near or upon lands which ever were 
* plantations of J. Geddis, Esq." At once it was seen that this loca- 
lity—detected last March by Mr. Lewis Foote, as announced in the 
May number of this Journal—though not far from Onondaga Hill, is 
far and nearly in an opposite direction from the residence and posses- 
sions of the late James Geddes, which are directly west of Syracuse. 
Mr. Foote having particularly described his station as in a rocky 
ravine, half a mile below the village, two hundred feet east of the rail- 
