TESTS OF WOOD PRESERVATIVES. 



The box was heated to 30° C. by electric lamps ; the temperature 

 being automatically controlled within 1° C. by a thermostat. The 

 treated specimens were removed and weighed at weekly periods for 

 3 months, the loss in weight being taken as representing the amount 

 of the preservative volatilized. 



Fig. 1.— Apparatus for conducting tests on volatility. 

 LEACHING TESTS. 



Tests were made on the water-soluble salts to determine the rela- 

 tive rates with which they leached from the treated wood. As soon 

 as possible after treatment stick 12 was recut into three pieces, each 

 I4 by H by 4 inches in size, and weighed separately to determine 

 the amount of preservative it contained. 



