162 



THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1953 



(a) 



(b) 



Fig. 14— Across the threshold— pentachlorophenol solution. Test fungus Len- 



rnH%HTfei7/^^?. p^rJI'^'J^T,^,^ treatment: (a) 0.052, (b) 0.099, (c) 0.193; 

 and (d) 0.238 Ib/cu ft. Photo by A.M. Hearn. 



