186 BOTANICAL GAZETTE [SEPTEMBER 
There are no discrepancies in Series V; the curves of fig. § 
approximate each other throughout and agree very well with those 
of Series II. 
Series VI (jig. 9) shows a fall in transpiration in culture 3, which 
does not occur in Series III. This fall in transpiration is accom- 
379, panied by a very much 
diminished relative weight, 
*’ although this does not 
amount to an actual depres- 
sion in the curve. Aside 
from this culture the series 
is in agreement with the pre- 
ceding, and the two curves 
are seen to be very closely 
similar throughout. 
2 3 4 3 
Fic. 8 
For the six similar series 
so far described, it appears 
that total transpiration is as 
good a criterion as green 
weight for judging of the 
relative growth in these 
soils. “The differences are 3 . 
generally somewhat more a: : 
marked by the weight cri- ion 10. 
terion than by that of transpiration. Series III is an ao be 
this, however. . yariols 
Series VII.—This series consists of Cecil clay? poo bees which 
treatments as given in the following table. The samples dite 
° This soil is from near Statesville, N.C. _Itis a stiff reddish Ys ood pot 
best soil of the Piedmont Plateau for general farming purpos¢s- 
varieties are markedly different agriculturally, but appear to be 
° Be far 38 
. dentical so fat 2 
analysis can determine. eee 
