Some observations are reported on soil extracts obtained by two methods of extracting soil organic matter. These methods yield products having urease activity that may be regarded as native humus. A somewhat lower urease activity is extracted than is commensurate with the carbon extracted but matches the nitrogen extracted in a summation of the contents of four major extracts, but such is not the case among the individual extracts. Further, following high-speed centrifugation it was found that sedimentation of urease activity is greater than that of the organic matter; hence the urease is not uniformly associated with the organic matter.