THE ETCHING OF MARBLE BY ROOTS IN THE PRESENCE AND ABSENCE OF BACTERIA.
In a study of the effect of soil bacteria upon the etching power of the roots of Canada field peas upon polished marble, it has been shown that the presence of the bacteria increases the etching power of the roots.
Fred
E B
EB
Department of Agricultural Bacteriology, University of Wisconsin, Madison.
Haas
A R
AR