2 DRAGON FLIES VS. MOSQUITOES. 



spent in rearing insects, studying their transformations and 

 lial)its, and of extensive special reading. 



These essays were found so full of valuable scientifie 

 and po])ular information that the recommendation of the 

 distinguished judges at-ting under the terms of the circular 

 letter, to place them in a printed form before the public, 

 has here been complied M-ith. An article contributed by 

 Dr. McCook to the "Xorth American Review" is repro- 

 duced with esjiecial view to his observations on mosquito- 

 catching spiders. Captain ISIacauley of the United States 

 Armv furnishes an interesting chapter of his experience 

 among the dragon flies and mosquitoes of the Upper 

 jNIissouri. 



