ILLUSTRATIONS 
Fig. 1. Map showing individual plantations of the Mississippi Delta Plant¬ 
ing Co. 
2. Upturned root mass of fallen tree where a few specimens of A. quad - 
rimaculatus were found amongst the exposed root fibers on March 28. 
3. Excavation made by falling tree exposing roots, pool of water beneath. 
Here, in February and March, culic-ines were found in larval and 
pupal stages and emergences observed. Anopheles absent. 
4, 5. Method of searching hollows in standing and fallen timber for hibernat¬ 
ing forms. The tree shown in figure 5 was seen to harbor many 
Anopheles in September, 1914 
6. A hole in a hollow tree receiving sulphur dioxide fumigation. 
7. Showing understructure of plantation houses, which are found to be 
fruitful sources of hibernating Anopheles. 
8. Showing understructure of plantation houses, which were found to be 
fruitful sources of hibernating Anopheles. 
9. Dr. M. ! s house, showing means of access by mosquitoes through lattice 
work and holes in brick under structure. Under this house the first 
hibernating Anopheles were collected during the first week of Feb¬ 
ruary. 
10. Typical cypress trunk with fissured structure in which leaves found 
lodgment to serve as possible hiding places for resting anophelines. 
Such places were not found to shelter mosquitoes. 
11. Canvas-covered canoe, which remained undisturbed during fall and 
winter. Shows the ripped canvas in the end of the canoe where sev¬ 
eral inches of water remained. No mosquitoes of any stage were seen. 
12. Showing the method adopted by use of horses as bait to attract ano¬ 
phelines in the woods. 
13. An inundated “ borrow pit ” on Whitehall plantation. Anopheles larvse 
were not found here during February. 
14. Junction of Deer Creek and Lake Bolivar, where in late fall larvae 
and pupae of A. quadrimaculatus were found. Seven persons among 
the fishing women on the bridge proved to be winter carriers of 
Plasmodium. 
15. Group of negro tenants on Lake Vista plantation. No case of sickness 
reported here, yet 43 per cent were carriers of malaria during Feb¬ 
ruary and March. 
16. Group of tenants on Myers plantation. 50 per cent were infected with 
malaria during February and March. No clinical case observed. The 
head of the family proved to be a gamete carrier. 
17. Showing apparently healthy negro tenants of Mound plantation en¬ 
gaged in clearing operations. Five of the eight men in this picture 
were winter carriers of malaria ; two of these harbored gametocytes. 
18. Photomicrograph of a stained preparation showing young oocysts on 
the stomach of an A. quadrimaculatus dissected May 15, 1915. This 
represents the initial infection of the spring season. 
19. Enlarged view of portion of figure 1-. 
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