The Campaign in Havana 255 



mosquitoes with great rapidity, and that the insects 

 were actually dead, not merely stupified, as is the 

 case with pyrethrum. With this observation as a 

 basis, a piece of apparatus, which will be described 

 in great detail later on, was evolved, which has given 

 excellent results in our hands. 



The apparatus was constructed with the idea of 

 removing every possible source of danger which would 

 occur with the mixtture, as well as to provide for the 

 fact that unskilled labor would have to be employed 

 in practical fumigation. Cheapness is the first consid- 

 eration, because it is frequently necessary to use 

 large numbers of pots in fumigating large buildings. 

 The use of galvanized iron, which is comparatively 

 inexpensive, not only reduces this factor, but makes 

 the apparatus light and not easily broken. 



To provide for the notorious lack of skill shown by 

 native workmen, steps have been taken to make it 

 absolutely necessary for the apparatus to be set up 

 correctly. It is practically impossible to make it work 

 in any other way than the correct one. Each and 

 every part must occupy its correct relation to every 

 other part, and of necessity this must be carried out in 

 order to evolve fumes. 



In order to prevent any possible accident due to 

 the catching fire of the camphor, a special fumigating 

 pan has been constructed — ^this pan is circular in 

 shape, with the edges turned downward and outward, 

 making a total diameter of seven inches. In section 

 it is concave, so that in reality it is a shallow bowl 

 having a diameter greater than that of the stand 

 upon which it is supported, with the edges turned 

 down at an angle of 45° with the perpendicular. 



This shaped pan is especially adapted to the evapo- 



