706 PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



Poivell Process. 

 The first lot of twenty pieces of powellized wood were all attacked 

 within eight months and were stated by the Company not to have 

 been treated properly. A second lot, sent in for trial as properly treated, 

 was placed underground on 17th October 1911, and consisted of twenty 

 pieces of wood, weighing 24-25 lb. on receipt. On 22nd July 1913, 

 after 21 months, three pieces were found to have been eaten into. By 

 27th February 1914, four other pieces were found to have been attacked, 

 after an interval of 29 months. By 3rd May 1915, seven more 

 pieces were found attacked, 43 months after having been biuried. On 

 1st August 1916, another piece was attacked, after 59 months. On 

 1st August 1918, another was foimd eaten into at one end, after 82 

 months, and only two pieces remained of the original twenty, the others 

 having been lost or eaten without leaving any trace. 



Lead Arsenate. 



