46 BOTANICAL GAZETTE . [JULY 
but the broad saw grass marshes so commonly encountered around 
the lakes near Leesburg were generally absent. The northern 
portion was first examined, but no material was found, because. 
the shallow nature of the lake in this region had prevented the 
accumulation of allocthonous deposits. A series of samples (dia- 
gram, 50, 51, 52, 57, 58, and 59) show the general character of the 
material near the shore. The basal stratum presents black, fine 
specimens of a decidedly sandy and diatomaceous nature, so com- 
monly encountered in the lower layers of lacustrine formations. 
This black gritty mass soon gives place to a deep gray lamina of 
similar texture. The only coarse débris found in this lake was an 
abundance of univalvate shells of the same species as those men- 
tioned in the discussion of the samples from Lake Harris. In 
this bed of peat there appears no transition from gray to pink, as 
is the case in the adjacent lakes, but the gray stratum is overlaid 
by a deep brown, fine, plastic deposit without the intervention of 
other formations. 
One and one-half miles east of Eustis there is a bog which may 
be classified as a small filled lake (diagram, 55 and 56). In gross 
characters this bog furnishes strata similar to those already de- 
scribed for localities 34, 37, and 38, and consequently may be 
considered as representative of like methods of accumulation and 
as having passed through parallel cycles of sedimentation. The 
deposit is now covered by a dense growth of species of Pinus, 
Cyperaceae, Gramineae, Polypodiaceae, etc. Samples taken in 
the usual way show the following qualities: The upper layer 
presents a fine, deep brown, plastic character, in which there is 
much evidence of partially decayed lignified elements intermixed 
with the less resistant, and consequently more reduced, portions 
of fallen plants. This type of structure is very uniform to about 
9 feet in depth, where it gives place, as usual, to a layer of herbace- 
ous peat. The basal region furnishes specimens of a fine black 
nature in which there is a large admixture of sand. From results 
obtained by a study of the soundings it is evident that this bed has 
pursued a filling process similar to that mentioned in the discussion 
of the filled lake near Leesburg. The lowest allocthonous peat 
was formed in deep open water, which condition continued until 
