UKi’OliT OF (’HKMIC’AL LAJiOKATOKV 
SuspendtMl 
matter in Ithie 
Nile water 
No sulphates 
in White Nile 
water 
As in 1005, the Blue Nile was found practically clear during tlie months of January, 
February, March and A})ril. As noted in the Second Eeport, tlie suspended matter found 
during these months is probably largely due to material blown into the river by the high 
winds which are so frequent during this season. During the Hood season a much more 
complete series of determinations of the sus^jended matter was made than was done for the 
previous year. The highest monthly average was for August (1964 parts per million), and 
largest quantity found was on August 4th, when the figure rose to 3294 })art8 per million. 
Al)se)ice of sulphates from White X He water .—No sulphates were found in the water of 
tlie White Nile during 1906, except in the single case of the sample collected on August 4th, 
which evidently contained a considerable proportion of water of the Blue Nile, which, 
during its greatest height, flowed up the White Nile for some distance. The cause of the 
absence of sulphates from White Nile water is discussed in the Second Eeport of these 
Laboratories, page 211. 
Tuibutakies iif the White Nile 
Ihxaminaiion 
of water from 
the tributaries 
of the White 
Nile 
A few isolated analyses were made of water from the Nile tributaries. The following 
two satnples from the Pibor' and the Baro' Rivers were collected by the Irrigation 
Department in January, 1906. That from the Baro River was taken near the junction 
(just upstream I of the I’ibor. The figures express parts per million. 
PI BOB B. 
BARO B. 
Solids in solution 
IIG-O.S 
84-00 
Oxygen consumed jit KM)' 
C. ill 10 min. (0)| 
4--ill 
i-00 
Chlorides . 
. (tu) 
1-89 
1-70 
Sulpluites 
.(SO.) 
uouo 
•2-81 
Carbonates 
. (C 03 ) 
.37-1.-) 
2G- Cl!) 
Calcium 
. (Ch) 
1.3-91 
9-14 
Magnesium 
.(Mg). 
9-43 
(i-9-7 
Sodium... 
. (Na) 
11-34 
•2-87 
Potassium 
. (K)! 
4-17 
1-.80 
We are indebted to the Director of Steamers and Boats for the following interesting 
samples which were collected, in the heart of the Bahr-El-(lhazal region, from the Namtilla 
and Bushari Rivers, which join to form the Jur. These waters were of very unusual 
composition, the result of peculiar and exceptional conditions. Complete analyses could 
not bo made, and the results are only aiiproxiniate, as there was not sufficient of the water 
available tor the purpose. 
NAMTILLA 
BUSHAKI 
Keactiou 
slightly alkaline 
acid 
Total solids on evap. tt) drvuess 
97-00 
112-00 
N itrates . 
... (N) 
0-19 
0-15 
Chlorides 
... (Cl) 
none 
none 
Sulphates 
- («oj 
none 
none 
Carbonates ... 
- (CO,,) 
9-^2-5 
none 
Calcium 
... (C.-i) 
3-38 
5-00 
Magnesium ... 
... (Mg) 
3-41 
3-85 
Sodium 
... (Na) 
2--29 
•2-3G 
Pot.issiiiin .. . 
... (K) 
0-98 
2-58 
Silica.. 
...(SiO.J 
52-80 
04-80 
These empty into the Sobat Kiver. 
