INFLUENCE OF EARTAWORMS ON SOIL REACTION. 417 
six of the locations are higher, and in three considerably so, than those of 
the surface soil (0-2 in.). In the two locations where the reverse was the 
Fre, 1. 
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204 " Organic content of 
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(Averages) 
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case the difference is not so marked. It would appear, then, that earth worms 
feed chiefly very near the surface, or, if in the subsurface, in regions of high 
organie content, 
