312 
MALARIA 
Malaria Parasitemia as Determined by Surveys 
in Three Test Areas, Wheeler Reservoir, 
1939 
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14 1 1 HARRIS STATION ' 
, 2 EH BUCKEYE 2 
,0 HI COTACO CREEK 3 
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APRIL AUGUST OCTOBER 
1. All households mosquito-proofed. 2. Control 
area; no houses mosquito proofed. 3. Mosquito- 
proofing 50 per cent complete July 1; 75 per cent 
July 15; 100 per cent August 1. Scale on left 
is number of cases per 100 persons. 
The findings thus far tend to confirm 
some earlier data indicating that mosquito¬ 
proofing is a reasonably effective measure 
against malaria. No final conclusions have 
been drawn, however, as it is believed ad¬ 
visable to draw conclusions only from ex¬ 
periences over a period of years which 
embrace, if possible, a complete cycle of 
high and low peaks of regional malarial 
transmission. Previous data have prompted 
the belief that this cycle in the Tennessee 
Valley has a period of about 5 years. 
An unusual feature of the construction 
program was that the work was done by 
contract on a unit price basis which has 
proved highly satisfactory. The usual 
form of construction contract was em¬ 
ployed, including specifications, proposal 
and contract. Bidders were required to 
submit a bidder’s bond or certified check, 
with the successful bidders subsequently 
posting a security bond not only to guar¬ 
antee the completion of the work on sched¬ 
ule, but also to guarantee the excellence of 
both workmanship and material. 
Since the specifications may be of inter¬ 
est, those used on the last contract are 
quoted as follows: 
Lumber, (a) Screen door frames shall be thor¬ 
oughly dried clear cypress—full one inch thick and 
three inches wide—S-4-S. (b) Screen door hang¬ 
ing strip shall be thoroughly dried clear cypress— 
full one and one-sixteenth inches thick by three 
inches wide—dressed one side, two edges, (c) Door 
and window facings, flooring, ceiling, etc., shall 
be No. 1 pine—S-4-S. 
Screen wires shall be galvanized wire screen of 
16 meshes per inch. 
Construction of screen doors. The attached draw¬ 
ing supplementing the above mentioned bulletin 
shall be followed in constructing screen doors. 
Material for screen doors, (a) Reinforcing plate 
for screen doors shall be cut from square of 24 
gauge galvanized sheet metal. (b) Hardware 
cloth. The screen wire in the bottom panel of the 
screen doors shall be reinforced with galvanized 
hardware cloth, 4x4 meshes per inch standard 
gauge wire. 
Nails. The wire clout nails used in fastening the 
metal reinforcing plates on the outside of the screen 
door shall be of sufficient length to clinch % inch. 
The inside reinforcing plates shall be put on over 
the screen wire and fastened with wire clout nails 
of length equal to the thickness of the wood frame. 
Binges. The hinges shall be 3" x 3" loose pin 
butt type and fastened with No, 8, 1" screws. 
Tacks. The screen wire shall be fastened to the 
doors with No. 6 bill poster tacks spaced 2" apart. 
Other items. The door pulls, hook and eyes, and 
coil springs as specified in the bulletin shall be 
included. 
Application of window screens. Window screens 
shall overlap the window frames full 1" on top and 
sides. The bottom edge shall be folded under, over¬ 
lapping sill two inches and securely fastened with 
a double row of tacks. Wire shall be fastened to 
the window frames with No. 6 bill poster tacks 
spaced 1" apart. 
Mosquito proofing material, (a) Paper for cov¬ 
ering walls and ceilings shall be 90 pound basic 
kraft weighing not less than 1 pound per 34 square 
feet, (b) Tacks. The paper shall be securely 
fastened to the walls with No. 6 bill poster tacks. 
(c) Roofing paper. The paper specified for cover¬ 
ing floors shall be two-ply or medium weight roofing 
paper weighing 45 pounds per 100 square feet. 
(d) Sheet metal for patching small holes in the 
floors and walls shall be twenty-eight gauge galva¬ 
nized sheet metal and securely fastened. 
Chimney protection. Omit the Napthalene cyl¬ 
inder and wire basket of moth balls for hanging 
in chimney. Fireplace openings shall be sealed with 
a removable ply board screen. This screen shall be 
constructed so as to seal effectively the fireplace 
opening. The unit price bid shall include the neces¬ 
sary repairs to the mantel facings and hearths to 
secure effective closure against the entrance of mos¬ 
quitoes. Specifications are shown on the attached 
drawing. 
These specifications were developed from 
earlier experience on such work in Ala¬ 
bama. Moreover, houses which had been 
