II 
blocks, a few, however, having asphalt blocks ; the less important 
streets are generally laid with rubble and macadam. The sidewalks 
are composed of stone slabs or artificial pavement, with gutters of 
stone. 
Electric light is employed to illuminate the streets of the city 
and many of the houses and offices. The residents are fortunate in 
being able to use electric fans, as they are almost indispensable in 
cooling the rooms and driving away mosquitos. 
The system of electric trams has proved a great boon to Manaos. 
The lines to Flores and other suburban parts are well patronised m 
the evenings by the residents for the cool ride through the swampy 
areas. 
Disposal of refuse. Collection of house refuse is made nightly 
by scavengers, who give an efficient service to the residents of the 
centre of the city. 
Drainage. There is a system of sewers for the intra-urban popu¬ 
lation, but none at all for the extra-urban inhabitants. 
Water supply. The water supply is derived from the Rio Negro* 
the inlet pipes being well above the city and sufficiently far from the 
shore to ensure a supply of uncontaminated river water. In 1909, a 
most elaborate filtration plant of automatic compressed air polante 
filters was installed. The filtered water is pumped up to the two 
reservoirs, Moco and Castelhana, which are built on the heights o 
Brown 
colour 
with 
Ki'eyTson i Nichols, M.Insi.C.'E 
Total Solids 
Hardness 
V e 
o o 
- — 
2-S 
C M 
Blackened 
Very 
slight 
trace 
>4 
< 
Grain s per 
Gall on 
0040 
HO 
J i 
5 c 
2 
o 
0125 
Oxygen absorbed 
from I’crmanganatt 
at 80° Fahr. 
o-8t 
Grains 
Gall 
•566 
per 
•950 
Organic £ _ 
Elements „r o 
b 
S 
rts p 
0,00 
060 
860 
= P- c 
S c 
2 O 
•3 U 
a 
U 
684 
Micro- 
Filter 
mm. 
per litre 
Pathogenic 
Organisms 
1 ro Bacillus Coli 
Communis 
in o‘l c.c. 
Poison- Streptococci 
ous not detected 
Metals 
Nil 
Strongly 
Plumbo- 
Solvent 
Microscopical 
Examination 
Oxide oflron and 
Peaty Matter. 
Numerous dead 
Aquatic Organ¬ 
isms. 
Daphina, See. 
Confero*. 
Moving Organ¬ 
isms, Infusoria, 
A!**, lee. 
