54 



MISCELLANEOUS RESULTS OF WORK OF BUREAU IX. 



Experiment No. 5. — May 22, at 6 p. m., fumigated a plant over- 

 night with one-half sheet of aphicide. There was a strong breeze. 

 May 23, the plant was uninjured. 



Experiment No. 6. — April 30, at 8.30 a. m., a plant was fumigated 

 with one sheet of aphis punk ( = 2 sheets of nico fume or aphicide) all 

 day; cloudy. Toward the end of the fumigation the punk began to 

 burn in strips, so it was not all consumed. It gave a very dense 

 smoke. The room was opened late in the afternoon. 



May 1, the plants were uninjured. 



May 2, live thrips were abundant on the plants. 



Experiment No. 7 . — April 30, fumigated with one-half sheet of aphis 

 punk (equal to 1 sheet of other kinds), but as it did not burn up, the 

 house was opened at 5.30 p. m. and a fresh piece put in. The fumi- 

 gation lasted all night. This piece also burned in strips and a third 

 was not consumed. 



May 1, the plants were uninjured. 



It seems that the thrips that drop to the ground have a better 

 chance to recover than those on the plant. 



Experiment No. 8. — May 1, at 5.15 p. m., fumigated all night with 

 one-half skeet of aphis punk (fresh box from the factory). This was 

 entirely consumed and the room well filled with smoke. 



May 2, the plants were uninjured; red spiders were alive. 



