STATE BOARD OF AGRICULTURE. 



EXAMPLE. 



One Passalus cortPiUus was confined with O.G c. c. of gasoline on the 

 absorbent cloth. 



Used 50 c. c. Ba(OH)o stock-solution, equal to 6.7 c. c. —— Sulphuric acid. 



Temperature, 72° F. 

 Began 2:45 p. m., Wednesday. 

 Ended 8:45 a. m., Thursday. Time, 18 hrs. 

 Wt. of beetle at beginning, 1.1485 grms. 

 Wt. of beetle at end, 0.9515 grms. 



At the end, cage quickly removed; flask stoppered again and left 20 minutes 

 before titrating. 



50 c. c. Ba(OH); then required only 5 c. c. 



N 

 10 



acid. 6.7 



5 = 1.7 c. c. 



10 



or 0.17 c. c. normal C0.> that had been given off by the insects. 



1 c. c. of normal C0„ = 0.022 grms. of C0„; 0.17 c. c. of normal CO, = 0.00374 

 grms. COo given off in 18 hrs. 



100X0.00374 



100 grms. of beetle = = 0.0207 grms. of CO., or 10.35 c. c. CO^ 



0.9515X18 

 at 0° C. and 760 m. m. Mercury. 



TABLE III A. 

 Effect of certain insecticides upon COt excretion. 

 (Different specimens — treated and untreated — other conditions the same). 



