Bul. 1098, U. S. Dept. of Agriculture. PLATE IX 
Fic. 1.—View toward dam and spillway, Bayou Walnut, from upstream, showing bayou filled 
with water. ; 
Fic. 2.—View across Bayou Walnut, showing aquatic grass, Zizaniopsis miliacea, in bed of bayou, 
above impounded zone. 
Fig. 3.—View along margin of Bayou Walnut, above impounded zone, showing natural bayou 
conditions. 
IMPOUNDING WATER TO CONTROL MALARIA MOSQUITOES. 
