186 ROCHESTER ACADEMY OF SCIENCE. | June 22, 
THICKNESS OF TRENTON. 
St. Catharines. Rochester. Wolcott. 
677 954 75° 
850 (?) 
THICKNESS FROM THE TOP OF THE MEDINA TO THE TOP OF THE 
TRENTON. 
St. Catharines: Gasport. Rochester. Wolcott. 
1635 1696 1756 1720 
THICKNESS FROM THE TOP OF THE MEDINA TO THE BOTTOM OF THE 
TRENTON. 
St. Catharines. Rochester. 
2312 2710 
The following paper was read by title: 
A LIST OF TAEAINDIGENOUS. FERNS OF THE VICING@ile 
OF ROCHESTER; WITH NOTES. 
By C. W. SEELYE. 
Ferns are properly mentioned as shade-loving plants. But with 
some species, at least, it is evident that the conditions they seek and 
require are those which are attendant upon shady places rather than 
the shelter from the sun; it is the moist atmosphere and the cool soil 
which are favorable to their existence, not merely the exclusion of 
more or less sunlight. The shaded sides of rocky banks, the banks 
of streams, bays and lakes, open or thin woods with undergrowth, the 
bases of railway embankments facing the north and north-east, rich and 
moist grounds which have been cleared from the forest and afterwards. 
allowed to grow up to small trees, shrubs and underbrush, all these are 
favorable situations for the growth of ferns. 
In many places some species of ferns will be found growing where 
they are quite exposed to the sun, but the conditions in such cases are 
always favorable to a more or less moist atmosphere and a compar- 
atively cool soil. As an instance of this kind may be noticed a certain 
locality which was under the observation of the writer for several 
4. The term *‘ Trenton”’ ts here intended to include all the strata from the Hudson-Utica to the 
Calciferous. 
