708 The American Naturalist. [August, 
CERTAIN SHELL HEAPS OF THE ST. JOHN'S RIVER, 
FLORIDA, HITHERTO UNEXPLORED. 
By CLARENCE BLOOMFIELD Moore. 
(Continued from July Number, 1893.) 
(Fourth Paper.) 
MULBERRY MOUND (ORANGE COUNTY). 
By referring to the map accompanying the first article of 
this series, the reader will see that Mulberry Mound lies on 
the west bank of the St. John’s, just north of the river’s exit 
from Lake Poinsett. Rising abruptly from the water’s edge 
the mound offers the only solid footing for miles around, and 
upon it the otter hunter on his way up and down the stream 
finds a welcome refuge. This island mound has been under 
cultivation in former years, but when visited (February, 1892, 
and February, 1893) was covered densely with vines, shrub- 
bery and sugar-cane. In all, eight days were spent in investi- 
gation with a party of eight workers. The mound extends 
from S.S. E. to N. N. W. The length of base is 285 feet; 
its maximum breadth 120 feet; its maximum height from 
water level at a low stage of the river is 15 feet, 6 inches. 
, Shell continues to an undetermined depth. The mound is 
unstratified, as a whole, and is composed mainly of uniones 
with a large admixture of sandy loam, PE occasional 
ampullarie and paludine. 
At no part of the mound investigated by the writer was 
there any evidence of the presence of loose masses of shell 
comparatively unbroken. Abandoned fire places were found 
at every depth. Upon the surface is a stratum of loam and 
sand from 1} feet to 23 feet in thickness. This layer is prob- 
. ably a formation subsequent to the abandonment of the 
. mound by the eaters of shell-fish, and all articles found 
1 American Naturatist, Nov., 1892. 
