3i6 



Arthur I. Kendall 



per; one may thus introduce or remove the lamp at any time without 

 interfering with the fumigation. 



The removable cage is especially important for the study of the 

 interval elapsing between stupefying and actual death of the mos- 

 quitoes. One places stupefied mosquitoes in the fresh air for a 

 time, and in this way determines the interval necessary to produce 

 the various sets of phenomena between the beginning of the experi- 

 ment and the actual death of the mosquito. 



FiQ.3. 



Fig. I. — Front of fumigation apparatus. 



Fig. 2. — Detail of door, showing overlapping surface. 



Fio. 3. — Device for firmly closing door. 



DETAILED DESCRIPTION OF THE FUMIGATING APPARATUS. 



The box in which the experimental fumigations are carried on 

 is made to contain exactly 100 cubic feet, inside measure. The 

 dimensions are five feet wide, four feet long, and five feet high; 

 this is approximately the average proportions of many rooms which 

 are fumigated in Panama, and these dimensions have been chosen 

 because it is beheved that the ratio of height to length and width 

 is not without influence in this work. 



The material is pine, covered with three coats of white paint, 

 to preserve the wood as well as possible from the action of moisture. 

 The door and window in the back are made in such a wav that 



