12 The New York State College of Forestry 
trasted with the alkalinity or hardness of water in basins in 
limestone areas of New York. He has shown that marl for- 
mation is abundant in the ponds and lakes of the limestone 
region and states that marl formation is lacking in most of the 
peat bogs of the Adirondacks. My observations confirm these 
statements, and they also show that marl formation indicates 
the agency of a heavy growth of submerged water plants 
(vascular plants lke Potamogetons accounting for quite as 
much marl as Chara). The marsh and swamp sequence in 
my observation tends to persist upon marl beds and as I have 
shown (2) in the case of Tully Lake Bogs only after the 
vegetation has created a situation involving lack of free move- 
ment and areation of the water does peat formation set in upon 
a marl bed. 
On the whole, my observations would indicate that the 
dominance of marsh and swamp plants in certain situations 
and of bog plants in topographically similar situations, is to be 
accounted for on the basis of factors now operative rather than 
as phenomena of post-glacial floristic relations. (17.) 
The Grasse River Bog 
The area here dealt with is locally known as the Grasse 
River Marsh.* It is a tract comprising several hundred acres 
lying along the south fork of the Grasse River some ten miles 
east of Cranberry Lake Village. It is traversed by the Grasse 
River railroad and is thus easily accessible. It is within easy 
walking distance of Grasse River Club station, Silver Brook 
stop, and Shurtleffs. Massawepie Like lies adjacent to the 
bog at its northeast limit so that Massawepie Park offers easy 
access to the bog region by auto and to the bog itself by boat 
or easy trail. The road from Massawepie Park to Conifer, and 
especially the branch to Grasse River Club passes just. back 
* These details of location and accessibility are given with the idea that 
this area in common with many other special features in the Adirondacks 
may become the object of closer study by those who spend seasons of 
recreation in the North Woods. It will add to the satisfaction of such 
experiences if one can gain a closer understanding of the region and its 
different types of vegetation. 
