A LABORATORY EVALUATION OF WOOD PRESERVATIVES 205 



termite attack. In addition all promising leads are verified by means 

 of the sapling test ^ at Gulfport, Mississippi, and here Nature has 

 provided a bountiful supply of these industrious insects. 



Fig. 11; — Growth on southern pine sapwood controls. From left to right; Polyporus 

 sulphureus, Polyporus vaporarius, Polystictus hirsutus and U-10. 



Fig. 12 — Growth on southern pine sapwood controls. Lenzites trabea, Fomes roseus, 

 U-10 and Lentinus lepideus. 



Experimental Results 



The above-mentioned fungi have been tested on untreated southern 

 pine sapwood in order to set up standards of comparison (Figs. 11 

 and 12). Table I shows individual weight and strength losses effected 

 by our most commonly used organisms in the regular 24-week period. 

 Considerable decay with many of these fungi occurs in a somewhat 



