cl LT LC TT TT TTT TT TT TT eee 
PI see od 
HARPER: COASTAL PLAIN OF THE CAROLINAS 359 
The proportion of cleared land in eastern Virginia and the 
Carolinas seems somewhat greater than in South Georgia, doubt- 
less because these more northeasterly states have been settled 
longer, and because their shorter distance from the great centers 
of population makes truck farming more profitable than it is in 
Georgia. As in Georgia, the destruction caused by agriculture 
has been much greater outside of the pine-barren region than 
within it.* The density of population in the regions traversed 
(outside of the cities of course) ranged from about 20 to 40 in- 
habitants per square mile in 1900, and is probably very little 
greater at the present time, for the evidences of recent growth 
which are conspicuous all through the pine-barrens of Georgia, 
Alabama, and Mississippi ¢ were scarcely noticeable in these older 
States. 
Vegetation. — The study of the laws of distribution of vege- 
tation in the coastal plain northeast of the Savannah Riveris by no 
means easy, especially as there is so little previous work to go by. 
The correlations between ranges of species and vegetation types 
on the one hand and the areas of various Tertiary formations on 
the other, which are so pronounced in Georgia and Alabama, 
seem to be very indistinct in the Carolinas, doubtless chiefly be- 
cause of the flatness of the country and the approximate horizon- 
tality of the strata; already mentioned. Next to the water-content 
of the soil, which here of course depends mainly on the local 
topography, and histdrical development, which has to be taken 
into consideration everywhere, the present distribution of plants 
in the region under consideration probably depends on the extent 
and thickness of the Columbia sand as much as on any other one 
factor. 
In general it may be said that between the Roanoke and Savan- 
nah rivers the pine-barrens proper t extend about two-thirds of 
* This is pretty well shown by the maps in the Tenth Census reports showing the 
ratio between the area cultivated’ in cotton and the total area. On account of the 
prevalence of cleared land I was able to make comparatively few notes in such counties 
as Aiken, Barnwell, and Florence in South Carolina, and Wayne, Wilson, and all north 
of there in North Carolina. 
+ See Bull. Torrey Club 32: 142. 1905; Torreya 6: 200. 
Acad. Sci. 17: 120. 1906. 
See Bull. Torrey Club 32: 452. 1905; Torreya 6: 42. 
Acad. Sci. 17: 16. 1906. 
1906; Ann. N. Y. 
1906; Ann. N. Y. 
