YELLOW FEVER EXPEDITION 535 
huts was occupied by new-comers, (man, wife, and three children). Three of these 
were examined, and certainly were suffering from malaria, and the other two were 
also ill. 
Pool 1. (About fifteen by eight feet), muddy, moderate amount of green 
algae ; one end shallower and eventually cut off during drier 
weather ; as seen when nearly dried out, probably deepest part 
when full not much more than a foot. Interval between Pools 
1 and 2 = twenty yards. 
Pool 2. (About thirty by fifteen feet), deep; very much green ; never dried out; 
water rather muddy. Interval between 2 and 3 = fifty yards. 
Pool 3. (About six by tour feet), shallow, not more than about 6-8 inches ; 
muddy ; no green growth. Interval between 3 and 4 = sixty 
yards. 
Pool 4. (About twenty by twenty feet), rather muddy generally; red growth, 
sometimes intensely ruddy ; no green obvious more than one 
foot deep. 
Pools 2 and 4, never yielded any Anopheles larvae. 
When first examined about the middle of September, Pool 3 was thickly crowded 
with Anopheles larvae (=+ + + + ), none were found in the other pools. 
Sept. 
29. 
Pool 
3- 
= + + + + Pool 1,-0. 
Oct. 
4- 
5) 
3- 
=Very scanty ; many water beetles. 
„ 10- 
-16. 
11 
3- 
=Very scanty ; pool drying up. 
)> 
19. 
Extremely scanty ; pool much reduced. 
>) 
23- 
■)1 
3- 
Drv ; other pools much reduced. 
Sept. 
1 . 
Pool 
1. 
Few + especially at end cut off from general pool. 
•>•> 
1. 
As yesterday ; Pool 3 consists ot a few hoof-mark 
= 0 ; Pool 2, no Anopheles. 
•>■> 
12, 
13, 15 
No Anopheles. 
Dec. 
3- 
Pool 
1 . 
Few Anopheles. 
■>•> 
7- 
1. 
No Anopheles. 
It may be noted that these pools were much haunted by dragon flies, and there 
were many water beetles, and a 'white and dark' water boatman, the presence ot 
which may account for some of the diminution or disappearance of the larvae ; 
Culex larvae were also present ( = c Taeniorhynchus fasciolatus). 
The following localities shewed the presence of Anopheles larvae : — 
At 'Para. 1. Shallow muddy pools about brickworks near Travessa Bonifacio, 
already mentioned. 
