THE PRELIMINARY SURVEY 127 



may he present. No determination of the Culex 

 varieties was made, but there are at least two. The 

 breeding belt of the greatest numbers of mosquitoes 

 was found to be elose to the river in low, wet areas. 

 The most important breeding places, from the stand- 

 point of malaria control, were found in all cases in con- 

 nection with the irrigation water, either in the shape 

 of seepage or overflow from the ditches, or else the result 

 of excessive or careless use of the water. In a few 

 cases, mosquito larvae were found in sluggish and weed- 

 overgrown ditches, and only very slightly in the natural 

 drains. Some of the creeks running through the 

 region breed mosquitoes in pools along their edges, 

 but not to any great extent, with the possible exception 

 of the mill ditch below the Runyon place. A copy 

 of my field notes is appended, giving my findings in 

 detail. 



Conclusions. — I have given in the appendix to this 

 report the various recommendations and directions 

 that I consider are necessary to control malaria on 

 this project. I consider that it is both possible and 

 comparatively easy to eradicate malaria from this 

 project with a reasonable expenditure of money, and 

 within a reasonable length of time. In regard to the 

 matter of expenditure of money I will state that the 

 greater part of the work required should be properly 

 charged to the maintenance account, as the necessary 

 work is largely a matter of good irrigation, in keeping 

 ditches in good order, and preventing loss of water 



