46 : BOTANICAL GAZETTE [SEPTEMBER 
manured. It was learned after analyses were made that samples 
41 and 42 were taken from a part of the botany gardens that had 
been filled in. The subsoil especially of this sample is not typical, 
its higher sulphur content than the subsoils of the other soils 
probably being accounted for by the filling in. The few Chicago 
soils analyzed are all much better supplied with sulphur, phos- 
phorus, and organic matter than any of the other soils analyzed. 
It may be that soils of as high a sulphur content as these Chicago 
soils might not need any sulphur fertilization, although in the 
case of certain high sulphur-using crops the available sulphur 
might not be sufficient. All the samples were taken from soils 
overlaid with sod, and have a high organic matter content. There 
TABLE VI 
SULPHUR, PHOSPHORUS, AND ORGANIC MATTER CONTENT OF CERTAIN CHICAGO SOILS 
_ Sample : Percentage} Lb. per | Percentage} Lb. per { Ignition 
no. Location Depth sulphur a. cieiphorie rong value 
39....| Midway 8 0.060 | 1200 0.100 | 2000 | 15.25 
an) i 8-26 0.021 420 OO8s | TTz0.- | 10.24 
41....| Botany Gardens o-8 0.055 | I1I0 6.075 + 1400 135770 
42....| Botany Gardens 8-26 0.045 goo 0.068 | 1360 | 13.08 
43....| South Chicago 0-8 0.069 | 1380 0.038 hae Mea fae Ge 
44....| South Chicago 8-26 0.023 BOO CVS Se 15.12 
Average surface OOM A) i sas 0,061 1220 0.070 1400 16.05 
PAVeTage SUDSOUS (- 6545555. 0.029 580 0.060 1200 12.81 
are probably many soils in Chicago of much lower sulphur and 
organic matter content, which might need sulphur fertilizers. 
It was thought interesting to determine how much of the total 
sulphur of the Chicago soils might be accounted for by the sulphate 
sulphur content. As is well known, where much soft coal is 
burned, much sulphur is given off. It would be expected, therefore, 
that rain would carry to the soil much more sulphur from a smoky 
atmosphere than from one free from smoke. WARRINGTON (quoted 
by Hart and Peterson (8)) gives the amount of sulphur carried to 
an acre surface of soil at Rothamsted as about seven pounds per 
year. Judging from their limited data, Hart and Peterson (8) 
estimate about the same figures are correct for University Hill 
Farm, Madison, Wisconsin. Data indicate a much higher sulphur 
