64 MALARIA 



summer. The Southern Pacific Railroad Company 

 responded readily to requests made for the correction 

 of drainage along the right of way in lower Placer 

 County, deeming it wiser to expend a larger sum for 



Fig. 28. A permanent correction. No longer a prolific source of mosquitoes. Same 

 spot as seen in Fig. 27. 



this permanent work than to apply oil, although this 

 was done in some places (Figs. 27, 28). The writer 

 mentions the fact because the wisdom of this pro- 

 cedure is recognized by large corporations. 



