Tg16] FORSAITH—ALLOCTHONOUS PEAT 41 
fibrous nature.’ The samples reveal the fact that the stratum is 
generally herbaceous and has been formed by the gradual accumu- 
lation of the plants which now grow upon the surface, among which 
Cyperaceae, Solidago, Eupatorium, etc., are the most abundant. 
The lower portion, however, showed evidences of an allocthonous 
origin on later microscopic examination. 
Silver Lake, a small circular lake one mile east of the previously 
mentioned town, presents external characters very similar to those 
already described for Lake Weir. Many tests proved that the 
floor is of a uniformly sandy nature, with a general absence of 
allocthonous formation except a very shallow and gritty layer in a 
sheltered cove on the eastern side (diagram, 30). 
Lake Harris, in Lake County, was visited next. This represents 
a large deep lake of irregular outline, bordered in many places by a 
broad saw grass (Cladium) marsh, as indicated by the shaded por- 
tion of the accompanying diagram. In many places there is a dense 
cypress swamp between this marsh and the rolling upland country, 
which gives place to hard woods where the shores are too steep to 
allow the growth of Cladium and other marsh-forming plants. 
Where the water is too deep to permit the growth of these species 
there occurs a fringe of Castalia, Nymphaea, etc., generally in more 
or less of a floating condition. 
One-eighth of a mile from shore (diagram, 31) a series of tests 
showed some very interesting characters. The bottom layer of the 
deposit presents samples of a pinkish color, owing to the presence 
of silt, infusoria, univalvate shells, etc. The substance is of a 
firm, plastic nature, with the usual absence of coarse material, as 
was revealed by a microscopic test by means of which much fine 
plant material was observed. In addition to this fine material 
there appears a variety of univalvate shells, which are apparently 
quite characteristic of this region, since they were also found in 
material from Lake Eustis. There has been no opportunity to 
have the species of these shells determined, but there is a possibility 
that they are very similar to those which HARPER (3) mentions as 
identified by Bryant WALKER, of Detroit, Michigan. In this 
Teport there are 25 species named, among which the genera Amni- 
cola and Planorbis supply the most species. These shells have a 
