458 



POPULAR SCIENCE MONTHLY. 



when they come to the surface to breathe, and so kills them (see Figs. 

 5 and 6). 



In Fig. 5 a 'wiggler' is seen trying to get air, vainly thrusting its 

 breathing tube up into the film of kerosene. 



Pig. 5. Thkee Times Larger than Life. 



In Fig. 6 the upj^er Sviggler' is grasping its breathing tube in its 

 mouth, apparently trying to pull off the small particles of kerosene 



Fig. G. Three Times Larger than Life. 



Avith which the tube has been clogged. The 'wiggiers' upon the bot- 

 tom have been suffocated and have given up the fight. 



An ounce (two tablespoonfuls) of kerosene will spread over fifteen 

 square feet of water surface, forming a film thick enough to kill all 



