6 



BULLETIN 1231, U. S. DEPARTMENT OF AGRICULTURE. 



One hundred and eight untreated check stakes were also set in the 

 ground with these treated stakes, 54 entirely of heartwood (numbered 

 from 194 to 247), the others with some sapwood; stakes treated by 

 each method or chemical were so arranged that there was an even 

 distribution of treatments throughout the test area. (See fig. 1 for 

 arrangement of stakes; also PL I, fig. 5.) 



In October, 1916, it was necessary, on account of change in location 

 of laboratory, to move all the treated woods to a new plot near by. 



The locality in Virginia where these stakes were set is one in 

 which termite colonies of several species of Eeticulitermes were 

 abundant, R. flavipes Kol. being the most common termite. No. 

 attempt was made to hasten normal attack by termites, hence the 



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9 CHA&PED 25-36. 



Fig. 1. — Arrangement of experimental stakes at Falls Church, Va. 



test is essentially a service test. Some of the untreated stakes had 

 become infested by March, 1913; after one year 57 and after 25 

 months 95 of the first lot of untreated stakes were attacked by 

 termites. 



On May 21, 1913, additional 2 by 4 inch southern yellow-pine 

 stakes were set in the ground, which were treated by more permanent 

 methods of impregnation by a commercial wood-preserving com- 

 pany, using coal-tar creosote oils and wood creosote. Analyses of 

 these coal-tar creosote oils were made by the manufacturer, whereas 

 the wood creosote was analyzed by the United States Bureau of 

 Chemistry, with the results shown in Table 2. 



In addition to being attacked by termites both untreated check 

 and treated stakes were also attacked by wood-boring beetles, espe- 



