Investigations Begarding Brack'' (Alkali) in Ca^je Colony Soils. 139 
THEBUS (STEYNSBUKG DIVISION) SOILS. 
Number. 
Sodium 
Chloride. 
Sodium 
Sulphate. 
Sodium 
Carbonate. 
Total Alkaline 
Salts. 
Calcium 
Sulphate. 
Calcium 
Carbonate. 
Magnesium 
Sulphate. 
Magnesium 
Carbonate. 
Total i 
Sa 
soluble 
Its. 
o 
Pn 
% 
/o 
% 
% 
% 
% 
% 
o/ 
/o 
% 
% 
K 1 
•034 
•034 
•006 
•007 
•024 
•071 
•204 
K 2 
•038 
•012 
•045 
•015 
•004 
•060 
•124 
K 3 
•055 
•055 
•013 
•049 
•053 
•170 
Zoo 
K4 
•083 
•210 
•293 
•283 
•028 
•212 
•81d 
. Q'70 
K5 
•073 
•237 
•310 
•030 
•029 
•121 

•490 
• Ana 
49b 
K6 
•103 
•181 

•284 
•067 
•031 
•274 

'bob 
<00 
L 1 
•191 
•048 
•239 
•019 
•017 
•023 
•298 
•372 
L2 
•161 
•181 
•342 
•144 
•035 
•224 
•745 
• CCA 
•obO 
L 3 
•118 
•120 

•238 
•026 
•035 
•015 
•314 
zoO 
L4 
•173 
•082 
•002 
•257 
, 
•019 
•035 
.oil 
•311 
oil) 
L5 
•205 
•108 
•005 
•318 

•016 

•043 
. O r7 r? 
377 
. Q OA 
ooO 
L6 
•102 
•088 
•039 
•229 

•Oil 
•057 
297 
oZo 
Ml 
•086 
•086 
•021 
•013 
•001 
•121 
•252 
M2 
•211 
•211 
•033 
•025 
•022 
•291 
M3 
•277 
•101 
•378 
•026 
•020 
•028 
'452 
OoZ 
M4 
•224 
•293 
•517 
•051 
•035 
•080 
•583 
. OAA 
bOO 
M5 
•242 
•037 
•279 
•021 
•159 
•031 
•490 
. KAQ 
M6 
•291 
•304 
•595 
•024 
•030 
•034 
•o83 
. QQ A 
ooO 
N 1 
•213 
•071 
•284 
•013 
•004 
•034 
•335 
•348 
N2 
•234 
•208 
•442 
•034 
•071 
•012 
•559 
•594 
N3 
•181 
•131 
■063 
•375 
•010 
•079 
•464 
•668 
N4 
•221 
•127 
•056 
•404 
•010 
•072 
•486 
•480 
N5 
•251 
•096 
•058 
•405 
•008 
•088 
•501 
•452 
N6 
•193 
•070 
•048 
•311 
•013 
•072 
•396 
•394 
PI 
•225 
•115 
•012 
•352 
•008 
•040 
•400 
•664 
P2 
•271 
•762 
1-033 
•572 
•023 
•279 
1^907 
2-160 
P3 
•193 
•146 
•111 
•450 
•010 
•101 
•561 
•608 
P4 
•159 
•104 
•111 
•374 
•008 
•116 
•498 
-604 
P5 
•205 
•055 
•129 
•389 
•009 
•125 
•523 
•672 
P6 
•216 
•023 
•156 
•395 
•019 
•142 
•556 
•570 
It will be seen that the soil at K is the only one which falls within 
the limits of safety as laid down by Professor Hilgard ; in fact K is the 
only soil which one would expect to yield a profitable return, and the fact 
that farming has been carried on there with fair success does not there- 
fore settle the matter for the entire valley. The lower layers of the soil 
at K contain a fair proportion of gypsum which has converted the noxious 
sodium carbonate into the less harmful sulphate. There is a general pre- 
valence of carbonate of lime throughout these soils, and in nearly every 
case a stratum of gypsum (calcium sulphate) runs through the soil at 
various levels ; this stratum appears in the fourth foot at K and M, and 
in the second at L and P. It is invariably accompanied by an increase 
in the proportion of other soluble salts, including those ^which produce 
