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very dilapidated, so that it would be difficult to screen them. We examined 
48 old iron tanks, many of them beyond repair. There was no attempt at 
screening. In many instances both the vats and tanks had been oiled, but the 
oiling had not been carried out regularly, and our examination showed no oil 
on the surface at the time of examination. 
We found 22 wells, many of them breeding mosquitoes, the majority, 
however, did not appear to be favourable breeding places. They usually 
contained dirty water, and were used in dry weather tor washing and wateiing 
purposes. We also found a considerable number of canoes, many of which 
harboured mosquito larva:. 
In addition to the preceding receptacles, many of the compounds were 
littered with old tins, broken pitchers, bottles, calabashes, flower-pots, conch 
shells, and other miscellaneous water-holding debris, all of which took a share 
in wet weather in breeding mosquitoes. 
Total Number of Lots Examined. 
From the 17th September to the second week in October we continued 
the systematic survey of the town, with the result that by October the 10th we 
had examined 836 separate lots, and of this number Mr. Burchell and myself 
had inspected 500. As the total number of lots, according to the plan of the 
town, is between 1,300 and 1,400, and as not all are occupied, it will be seen 
that we examined between one-half and two-thirds of all the lots, a number 
sufficient to furnish accurate figures of the abundance or otherwise of the 
Stegomyia fasciata in Belize. 
In the following analysis I have included the total number of water 
receptacles examined in the 836 lots, including the barrels, the large wooden 
vats and iron tanks and the wells, and excluding the very numerous kerosene 
oil tins and odd receptacles of all kinds. The number of barrels more than 
doubles the number of vats and tanks put together, whilst the number of wells 
is comparatively small. 
The Barrels . — Number examined, 1,342. Mosquito larva: were far more 
numerous in the barrels than in any other form of receptacle. I hey w ere, as a 
rule, present in enormous numbers, and I could always find them even after 
heavy rains, when the barrels had in consequence overflown for some considerable 
length of time. It has been stated that in the wet season the flush-out of the 
barrels by the overflow would get rid of the larvie. 1 do not think so, as 
nothing short of the complete emptying of a barrel and subsequent scouring will 
dislodge the larvae and eggs ; furthermore, one never finds all the barrels over- 
flowing at once. 
The barrels appear to afford more favourable conditions for breeding than 
the other receptacles. They are deep and dark enough to give protection to the 
larvae from the direct action of the sunlight, and they are not so deep that the 
larvae cannot readily seek the bottom for shelter when disturbed ; the temperature 
of the water is also probably more favourable. 
The Kerosene Tins. — Number very great, not counted. Where the tins 
were in constant use I did not find larvae ; where, however, the tins were 
