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Figure 1.-- Steel spike, 25 inches long and three -fourths of 

 an inch in outside diameter, consisting of sections which 

 have been drilled out so that each section (except those 

 at the ends) contains a compartment for the accommodation 

 of test lots of insects. Four holes are drilled through 

 the wall into each compartment to enable the fumigant to 

 reach the insects, (Drawing hj Mrs. Mary F. Benson.) 



