452 



STATE BOARD OF AGRICULTURE. 



Fig. III. SLOWS half of a duplicate gas apparatus used for stud.vmg the influence of 

 various agencies on certain activities of insects and insect tissue extracts : a == gas nureite , 

 li = rubber tube connected witli mercury mug; a' = tube leading to duplicate gas burette, 

 f = burette for hydroquiuoue solution or hydrogen peroxide or etc. ; m == tube connecting 

 gas container •'c" witii a mercury manometer; tli.= tbermometcr ; t = outlet ot gas-cocli. 



