98 BOTANICAL GAZETTE [FEBRUARY 
and phosphorus. Samples 15 and 16 were taken a few rods apart, 
the former from a field which had been in alfalfa for several years, 
and the latter from virgin land. Both have practically the same 
phosphorus content, but the sulphur is much higher in the virgin 
soil. 
All the soil samples from Kentucky (nos. 19-34) are residual 
limestone soils, but no. 34 was derived from the Trenton limestone, 
which is high in phosphorus, while the others are all from the 
Cincinnati limestone, but no. 28 was taken from soil derived 
from Cincinnati limestone, but it was only a short distance from 
thedivision line between the Cincinnati and Trenton formations, and 
had probably received some material from the Trenton formation. 
Samples 19-27 are from Mason County, while samples 28-34 are 
from Mercer County. Samples 19 and 21 are clay loams, while 20 
and 22-27 are silt loams. All are light brown to grayish brown in 
color. Sample 34 is a heavy clay loam, sample 28 is a heavy silt 
loam or light clay loam, while samples 29-33 are silt loams. 
Samples 31 and 33 are quite gray in color, and 33 contains iron 
concretions. No. 31 is known locally as white oak land, and both 
are recognized as poor soils. All the other samples are light brown 
except no. 34, which is a grayish brown. All the Kentucky soils 
are low in volatile matter except the clay loams, in which part of 
the volatile matter is probably water of combination. Allare low 
in sulphur, no. 34 being the only one above 0.03 per cent. This 
sample is from the Trenton formation and contains many un- 
weathered fragments of limestone. It is possible that the sul- 
phur content as well as the phosphorus content of the Trenton 
limestone may be higher than in other formations. No. 34 con- 
tains 0.3407 per cent of phosphorus, which is eleven times as great 
as the sulphur content. This is much higher than any of the others, 
but all the others are high in phosphorus. 
RELATION BETWEEN AMOUNTS OF SULPHUR AND PHOSPHORUS 
REMOVED BY CROPS AND SULPHUR AND PHOSPHORUS CONTENTS OF 
sorts.—A better idea of the supply of sulphur and phosphorus in 
the soil can be obtained if the pounds per acre of these elements 
found in the surface soil is compared with the amounts removed by 
some of ourcommon crops. Table II gives the amounts of sulphur 
