395 
white fragments of calcium sulphate and phosphate were visible 
here and there throughout the mass. The material had no charac- 
teristic odour. 
SAMPLES SENT BY SUPERINTENDENT, EXPERIMENTAL 
PLANTATIONS, F.M.S. 
This was described as having been obtained 
within three inches of the surface. The spe- 
cimen weighed about five ounces, and con- 
sisted of a reddish-brown earthy powder. 
This was collected at a depth of six inches ; it 
weighed about six ounces and consisted of a 
dark brown earthy powder. 
This specimen was obtained at a depth of one 
foot. It weighed about six ounces and was 
composed of a light yellowish-brown moist 
powder. 
CHEMICAL EXAMINATION. 
The four samples of bat guanos were chemically examined in the 
Scientific and Technical Department of the Imperial Institute, and 
gave the following results : — 
A. 
No. 1. 
No. 2. 
No. 3. 
per cent. 
per cent. 
per cent. 
per cent. 
Silica Si 0 2 
8.42 ... 
31.62 ... 
19-79 • 
•• 21.77 
Alumina A 2 O s ... 
2.56 ... 
II.36 ... 
IO.78 . 
... IO.70 
Ferric oxide Fe 2 O s 
1*75 
II.03 ... 
9.05 . 
.. 8.28 
Manganous oxide MnO .31 
.20 ... 
.19 . 
.. .13 
Lime CaO 
22.27 
I.81 ... 
1.86 . 
2.32 
Magnesia MgO 
trace . . . 
I.03 .>. 
1 .04 . 
-95 
Cupric oxide CuO . . . 
.34 ••• 
■ 37 , 
•35 • 
•34 
Potash K 2 0 
2.01 ... 
1. 12 ... 
.88 . 
.88 
Soda Na 2 0 
1.30 ... 
.78 ... 
•75 • 
•• -79 
Ammonia NH 3 
00 
1-0 
.12 ... 
.14 • 
.12 
Nitric acid N 2 0 5 ... 
7-55 •■• 
.81 ... 
.91 • 
... .86 
Phosphoric acid P 2 O s 
17.52 ... 
8.60 ... 
10.86 
... 14*17 
Sulphuric acid SOJ 
16.32 ... 
.41 ... 
•53 • 
.. .50 
Chlorine C 
.13 ... 
trace . . . 
trace 
Combined wafer H 2 0 
4.36 ... 
2.91 ... 
2.62 
. .. 2.24 
Moisture 
9.59 ... 
21 .26 ... 
22.92 
. .. 26.60 
Organic matter ... 
4.88 ... 
6.57 ... 
17.21 
. .. 9.62 
Total nitrogen ... 2,47 
Phosphoric acid soluble 
in water ... .81 
Phosphoric acid soluble 
in ammonium citrate 
.81 ... 
1.52 
... .84 
solution 
3.25 • •• 
7.38 ... 
8-54 
... 9-75 
Sample No. I. 
Sample No. 2. 
Sample No. 3. 
