DuRING THE SUMMER OF IQOI 287 
trees, of great variety and often of magnificent proportions, inter- 
spersed with cane-brakes of Avundinaria gigantea twenty or twenty- 
five feet tall. Zaxodium distichum is here conspicuous by its ab- 
sence, whether because of the steepness of the banks, or for some 
other reason, 1 do not know. ‘These banks are so high that they * 
are never overflowed, consequently there are no ‘bottom lands”’ 
along the river here. 
At the time and place of our visit to the Chattahoochee River 
about ten feet of Cretaceous rocks were exposed at the base of 
the bank, rising perpendicularly from the water's edge, the rest of 
the bank being composed of the Columbia sands. Very few flow- 
ering plants grow on these rocks, which are difficult of access on 
account of their perpendicularity, but numerous springs issuing 
from the bank along the line of contact of the two formations 
supply moisture for many mosses and liverworts. 
Early the next morning we visited an interesting pond (the 
only one seen in the Cretaceous region) in the woods south of 
Omaha (nos. 1095-1099). Later in the day we went up the left 
bank of the river a few miles (nos. 1100, 1101), then turned away 
from the river and walked east as far as Louvale. On the morn- 
ing of the 20th we walked to Lumpkin, and from there took the 
next train back to Leslie. Between the river and Louvale I did 
not stop to do any collecting, but made many notes on the flora 
of the Cretaceous uplands. The flora of this region, at least in 
Stewart County, seems to be mostly a mixture of that of the 
Tertiary region nearer the coast and the metamorphic region on 
the north, with few if any endemic species. The abundance of 
Arundinaria is one peculiar feature, however, as in the corres- 
ponding portion of Alabama. The Cretaceous region of Georgia | 
is doubtless analogous to the “tension zone’’ of New Jersey (de- 
scribed by Dr. Hollick*), which is also Cretaceous. 
‘Our next trip outside of Sumter County was on the first three 
days of August, to Adams, in Lee County, midway between 
Americus and Albany. While traveling southward from Amer- 
icus I was interested to see the same succession of topographic 
and floral zones that I was already familiar with between Americus 
and the Flint River to the eastward. These zones, which seem 
* Am, Nat. 33: I-14, 109-116. 1899. 
