DvuRING THE SUMMER OF IQOI 289 
length, except in a few holes which are deep enough to hold water 
throughout the year. The flora of the Slough is not very remark- 
able. The principal woody plants in it are medium-sized bushes 
of Quercus Virginiana, Crataegus aestivalis, and Diospyros Vir- 
gimiana, with Pinus palustris in drier places. Among the herba- 
ceous species in the Slough may be mentioned Sforodclus Flort- 
danus, Acerates Floridana, Breweria aquatica, Diodia teres, Chrys- 
opsis graminifolia and Rudbeckia Mohri, This is very much the 
same kind of flora as is found around the mayhaw (Crataegus 
aestivalis) ponds of Sumter County. Nama ovata, conspicuous 
with its large bright blue flowers, was the only species found in 
the Slough which I had not seen elsewhere. 
On the 8th we continued our journey as far as Thomasville. 
The next day was occupied with a trip to the type locality of 
Nymphaea orbiculata, about six miles northeast of the city (nos. 
1171-1181). On the 1oth we traveled west 21 miles, to Whigham, 
in Decatur County, in the midst of a topographically and botani- 
cally remarkable region. The surrounding country is quite hilly, 
much more so than that a few miles to the northward, and the 
forests are composed almost entirely of deciduous trees. Although 
less than sixty miles from the Gulf of Mexico, one standing in 
these deciduous forests could easily imagine himself among the 
mountains 250 miles farther north. Similar conditions prevail near 
Thomasville, though perhaps not in such marked degree; also at 
Tallahassee, Florida (which is about thirty miles from Whigham), 
according to the reports of geologists and botanists who have been 
there.* 
Five or six miles north of Whigham these densely wooded 
hills terminate and the comparatively level pine-barrens of the 
Lower Oligocene or lime-sink region are again seen. About 
seven miles from Whigham is one of the most remarkable lime- 
sinks in the state. It is known to some geologists as Forest Falls, 
but the inhabitants of that region call it simply the ‘“ Lime Sink.” 
There is a full-page illustration of it with description in Bulletin 
No. 5 of the Georgia Geological Survey. This lime-sink differs 
from all others which I have seen in its great depth (about ninety 
feet) and in containing a waterfall eighty feet high, making it one 
* See Nash, Bull. Torrey Club, 23: 96. 1896. 
