1922] EATON—SULPHUR CONTENT OF SOILS 45 
although somewhat greater than the Maryland and Oklahoma soils, 
and decidedly greater than the Alabama soils. The phosphorus 
content is also rather low, although much higher than the sulphur 
content. There is a fair amount of organic matter present on the 
average in the soils. Reference was made previously to certain 
soil analyses in Kentucky, Iowa, Kansas, Wisconsin, and Ohio. 
Judging from my analyses and those referred to in the introduction, 
many soils in the middle states need sulphur. Some of them are 
well supplied, however, and on the average they seem to have a 
higher sulphur content than the soils of either the Atlantic or 
Pacific coasts, although not enough analyses or fertility experiments 
have been made to make a positive statement as to this. On the 
other hand, some of the soils are as low in their sulphur content 
as any of the coast soils, so that it would not be surprising if sulphur 
should prove beneficial on these soils. Demonstration experiments 
on as many of the central states soils as possible are needed to 
determine how generally sulphur is deficient. 
Not many experiments of this kind have been performed. Cer- 
tain investigators in Kentucky (25), Wisconsin (9, 28), and other 
States, in pot experiments, have secured increased yields from 
sulphur fertilization in the case of alfalfa, clover, radishes, rape, 
turnips, mustard, tobacco, and soy beans. In field experiments, 
JARDINE and Catt (11) attribute the increased yields in Kansas 
secured by fertilizing alfalfa with acid phosphate to the phosphorus 
of the acid phosphate, but here again there is the possibility that 
the sulphur contained in the acid phosphate is at least partly 
responsible for the increased yields. During the last few years the 
Gypsum Industries Association has conducted a number of experi- 
ments, seeking to determine the value of gypsum as a fertilizer 
for crops. Beneficial effects have already been secured in a 
number of cases. Such work should be extended. 
Table VI records the results of the analysis of a few samples 
taken within the environs of Chicago. Each sample includes a 
number of borings and is therefore composite. The sample from 
the South Chicago region was taken from what seemed to be a 
natural prairie. This soil had probably never been fertilized. 
The Midway, where samples 39 and 40 were taken, is quite often 
