WOOD SOIL CONTACT CULTURE TECHNIQUE 



197 



For comparison, a similar test was made according; to the method de- 

 scribed by Waterman, Lcutritz, and Hiir\ 1938, in which the test blocks are 

 placed on inoculated sapwood slabs supported over water in capped wide- 

 mouthed bottles. Comparison of the average percent weight loss due to 

 decay for all organisms by both methods, I'ig. 2, shows that the water-wood 

 method is far less efTcctive in producing decay than the soil method. 



o < 



MONTHS 



Fig. 2 — Comparison of average weight loss and final moisture content by wood-water 



and wood-soil techniques 



An additional experiment was conducted with several strains of two of 

 the fungi previously used, Coniophora cerebella and Lciiliiius Icpideus. The 

 Coniophora cerebella strains were as follows: 



Baarn, from Dr. Johanna Westerdyjk, Holland 



Liese, from Dr. Liese, Germany 



Idaweiche, from Dr. Idaweiche, Germany 



Madison, from Forest Products Laboratory, Madison, Wisconsin, iso- 

 lated from oak, November 13, 1919 



BTL, also from Forest Products Laboratory, Madison, Wisconsin, 1930 

 The Lenlimis lepideus strains were from the following sources: 



No. 534, from Forest Products Laboratory, Madison (No. 534) 



BTL U-1, U-13, U-14, and U-32, from creosoted pine telephone poles 

 which had failed in service 



