124 BELL SYSTEM TECHNICAL JOURNAL 



assayed by the petri dish method, and the field test results are included for 

 comparison with the results of the soil contact test method. 



Fig. 6 — Antagonism which has persisted for over one year between the wood-destroying 

 fungus, Lentinus lepideus (outer portion) and contaminating fungus (inner portion) in a 

 soil culture. 



During the initial stages of this research on the evaluation of toxic prop- 

 erties of various compounds for wood preserv'ation, the petri dish method 

 was used for assay studies in the laboratory and the modified sapling method 



