152 OHIO STATE ACADEMY OF SCIENCE. 
Around the margin of the lake is a fringe of trees, the rem- 
nants of the former general forest, and within this is a series of 
concentric zones of vegetation which finally disappear in the 
water, as is usual in such locations. Evidence of rapid filling is 
present on the west side, where a new series of zones has pro- 
duced considerable confusion in the centripetal progression. On 
the east side there is a wide mud flat inside of the shrub zone, 
which is just now beginning to be invaded by hydrophtic shrubs. 
The most perfect and primitive arrangement of the vegetation 
appears at the north end, where a small, low wood-lot has afforded 
protection from the cultivated field beyond. At the south end 
the natural conditions have been entirely changed; here the 
vegetation has been removed in order to enlarge the available 
ice-producing surface. The water is thus shallow and some of 
the zones are either entirely absent or represented only by isolated 
individuals. There is here also a patch of low woods which lies 
between the railroad and the lake and formerly the zones were 
very perfectly developed, as will appear from the photograph 
taken in 1887 (Fig. 1). 
Glacial lakes are of interest in many ways, but especially 
because of the rapid changes which must have taken place in 
comparatively recent times in climate and soil. How far these 
lakes present similar plant societies as one passes from their 
southern limits northward is still to be determined. Several 
glacial lakes have recently been studied in detail, among which 
may be specially mentioned the ‘‘Three Sister Lakes,’’ near 
Ann Arbor, Mich.’ 
One of the authors of the present paper is quite familiar with 
the vegetation and surroundings of these ‘‘ Three Sister Lakes,’’ 
having often botanized on their banks, and though there are 
striking similarities in some of the zones, on the whole there are 
very great differences, as will appear by comparing the reports of 
Reed and Weld with the description of Brush Lake. That the 
difference is not primarily due to latitude will be evident from the 
fact that a number of plants characteristic of the Michigan lake- 
lets also occur in the Licking Reservoir, about thirty miles east 
tr. REED, HOwaRD S. A Survey of the Huron River Valley. I. The Ecology of 
a Glacial Lake. Bot. Gaz. 34: 125-139. 1902 
WELD, LEwis H. Botanical Survey of the Huron River Valley. II. A Peat 
30g and Morainal Lake. Bot. Gaz. 37: 36-52. 1904. 
