70 
On Bats' Chiano. 
As a further proof of the variable composition of Bahamas 
guanos, the following analyses of two samples of cargoes recently 
imported into England may be quoted : — 
Detailed Composition of Two Samples of Bahama Guano. 
No. 1. No. 2. 
Moisture 
*Organic matter 
JPhosphoric acid, soluble in water 
§ „ insoluble in water 
Lime 
I\Iagnesia 
II Carbonic acid 
^Sulphuric acid 
fXitric acid 
Alkaline salts, including potash, not deter-l 
mined / 
Oxide of iron 
Alumina 
Insoluble siliceous matter 
* Containing nitrogen 
Equal to ammonia 
t Containing nitrogen 
Equal to ammonia 
Total nitrogen 
Equal to ammonia 
X Equal to tribasic phosphate of lime 
II Equal to carbonate of lime 
^ Equal to sulphate of lime 
9-45 
21-27 
11-41 
27-97 
12/ 
-25 
13 - 05 
4-34 
20-13 
17-53 
•13 
• • 
1-12 
8-53 
11 •08 
•66 
2* 15 
•91 
1-46 
( 201 
\ 'GO 
7-29 
514 
1 5-57 
17-44 
9-84 
100-00 
100 00 
-94 
1-09 
1-14 
1-32 
•55 
-23 
•67 
•28 
1-49 
1-32 
1-81 
1-60 
2-77 
•55 
28-49 
9-47 
19-39 
IS '83 
The most striking differences in the composition of these two 
guanos will be noticed in the proportion of soluble and msoluble 
phosphates. Whereas the first sample contained 2| per cent. of 
soluble and 28^ per cent, of insoluble phosphates, or, in round 
numbers, 31 per cent, total phosphates, the second contained 
only 10 per cent, of soluble and insoluble phosphates. Again, 
it will be observed that No. 1 was much drier than No. 2, and 
that it contained 19 per cent, of sulphate of lime, and no car- 
bonate, whilst the second sample contained scarcely any sul- 
phate ; but, instead of it, rather more than 19 per cent, of 
carbonate of lime. 
The last sample of Guanahani guano which has come under 
my notice, and which I submitted to a complete analysis, fur- 
nished the following results : — 
