14 BULLETIN 1098, U. 8. DEPARTMENT OF AGRICULTURE. 
Removal of trees and stumps and cutting into suitable lengths for 
hauling away: . 
16. men, 8 days, a0-$h25222 322-8) e ee ee $160. 00 
1 team. and’ driver, 4 days,-at-$3>— eee, 12. 00 
$172. 00 
Raking edges and burning trash, 4 men, 6 days, at $1--______________ 24.00 
Fill or cross levee at dam, 6 teams and drivers, 5 days, at $38__________ 90. 00 
Lumber for spillway, 7,000 square feet cypress, at $18 per M__________ 126. 00 
Carpenter work on spillway: 
1 carpenter,—6 days, sat’ $2.25. == ae ee ee 13. 50 
1 helper,:@ days, at $1.90... 225 32 ee 9. 00 
2. helpers; 2-dayS, at $122 2 32s ss ee STR een 
26. 50 
4 io) 6s ene eee eee Se SA a $611. 00 
MAINTENANCE WORK FOLLOWING CLEARING AND CONSTRUCTION. . 
A comparison of the cleared bayou, before the water backed up 
over the bed, with the natural conditions that have already been 
shown, may be made from the illustrations in Plate VII and Plate 
VIII, Figure 1. These views were taken after the undergrowth had 
been burned and the wood from the trees and logs had been hauled 
away. Later in the year, at the onset of the winter rains, the water 
began backing over the bed above the dam. This condition is shown 
in Plate VIII, Figure 2. It is noted that quite an amount of débris 
was floated to the surface. As the water level was raised, this float- 
ing material collected along the margins, and this was cleaned out 
with rakes and burned. The appearance of the bayou later in the 
season, when filled with water, is shown in Plate VIII, Figure 8, 
and Plate LX, Figure 1. 
The only maintenance work, in so far as vegetation is concerned, 
was the clearing of the “ floatage” along the banks following the 
first rise of water and cutting back a comparatively small amount 
of second growth, mostly grass (Zizaniopsis muliacea) and willow 
shoots that found their way to the surface of the water the follow- 
ing spring. These shoots were removed by the use of a boat and a 
curved knife on a long handle. Maintenance work has been re-— 
quired on the dam by reason of the work of crawfish, Cambarus Sp., a 
about the spillway, and this difficulty, as well as the effect of the 
work of the crawfish on the water level above the dam, and in turn 
the effect of the change in water level on the marginal vegetation, 
will be discussed later. 
SURVEY OF ANOPHELES BREEDING AFTER IMPOUNDING. 
A comparison of the Anopheles breeding in the impounded area 
and in the natural bayou is shown by the collections in the general 
survey work for the years 1916 and 1917. The records for these col- 
lections are listed in Table 7. 
