I 
1 6 Bidletin of the Natural History Society. 
Lake, having been observed in Div. 2, but the numerous twigs and 
branches of soft-wood trees buried in the Lacustrine clay at this 
horizon are probably in part of this species. The leaves were 
smaller than the average of those of living trees. 
The Larch {Larix Americana) was also first detected in the 
Eastern Basin, but occurs at a higher level in the Lake deposit. 
In their slenderness, and the close approximation of the nodes to 
which the leaves were attached, the twigs resemble those of trees 
that grow in bogs, or wet land with a cold northern aspect. 
The Sweet Gale [Myrica Gale), a bush with leaves that yield a 
balsamic odor when crushed, was plentiful around the borders of 
the Eastern Basin when the beds of No. 5 were deposited in the 
Lake. 
In the Eastern Basin at the horizon of No. 6 of Lawlor’s Lake 
deposits, cones of the White Cedar [Thuja occidentalis) were first 
observed — and the same basin at No. 7, contained remains of the 
Yellow Bii'ch [Betula lutea), — a species of Willow and a number of 
species of deciduous shrubs and trees, including Birch, Alder and 
other kinds, still undetermined, grew around the Eastern Basin, or at 
Lawlor’s Lake. Among species that grew in a pond in the former 
was the Water Lily (Nuphar advenaf) and both sheets of water 
were plentifully supplied with several species of Pond Weed 
[Potamogeton). 
The scarcity of the seeds of the Bog Cranberry in the bed above 
the Lake peat. No. 5, appears to be connected with the appearance 
in the Lake Basin of a grass, the seeds of which first appear in the 
upper part of No. 5<x. These seeds increase rapidly in number, in 
passing upward through No. 6, and in 6c are enormously abundant. 
120 seeds have been counted in a cubic inch of this part of the deposit. 
In their numbers are much reduced, and throughout No. 7 they 
are about half as numerous as in No. 6c. In division 8 there is a 
great falling off in the abundance of these seeds and throughout 
No. 9 they are quite scarce. This grass must have grown in im- 
mense quantities around the shores of the lake when the peaty 
marl of Nos. 6 and 7 was being deposited. The appearance of this grass 
was synchronous with the exclusion of turbid waters from the lake, 
and its presence may have been connected with causes which led to 
a change in the mineral composition of the deposit in the lake, for 
