TESTS OF WOOD PRESERVATIVES. 5 
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. 
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TEST SPECIMENS 
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| Fic. 1.—Apparatus for conducting tests on volatility. 
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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 
| 1¢ by 14 by 4 inches in size, and weighed separately to determine 
the amount of preservative it contained. 
\- 
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