448 
On Pliosphatic Guanos. 
Patagonian and Falhland Island Guano. — The character of 
these South American guanos varies extremely, and even the best 
samples are in reality much damaged by rain. Generally 
speaking, the deposits on the Falkland Islands are better than 
those found on the Patagonian coast. Falkland Island guano 
can hardly be called " phosphatic," for it contains, as will 
be seen by the subjoined analyses, a considerable amount of 
ammonia ; and reference is made to it in this place, because 
guano, evidently from the Falkland Islands, is sometimes im- 
ported as Patagonian. 
Composition of Two Samples of Falkland Island Guano. 
No. 
1. 
No. 2. 
33 
43 
35-86 
21 
42 
26-07 
Phosphates of lime aud magnesia (bone-phosphates) 
32 
04 
22-01 
2 
52 
5-64 
6 
22 
7-34 
4 
^37 
3-08 
100 
CO 
100-00 
4 
31 
4-42 
0 
23 
5-37 
Falkland Island guano is generally very wet and lumpy ; it 
gives off a strongly pungent odour, and contains much volatile 
carbonate of ammonia, seldom more, and frequently less, than 
5 per cent, of ammonia. 
The variable character of Patagonian guano is strikingly 
exemplified in the following analyses : — 
Composition of Patagonian Guano, 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
*Orgauic matter ami salts of ammonia .. 
Phosphate of lime nnd magnesia .. 
Carbonate aud sulphate of lime 
, Insoluble biliceoiis matter (sand) .. 
21-4G 
11-74 
27-61 
2-99 
6-07 
30-13 
19-55 
11-08 
16-58 
8- 92 
9- 39 
34-48 
6-59 
10-23 
23-44 
9-05 
50-69 
1 22-lS 
20-01 
1 27-94 
29-87 
100-00 
100-00 
100-00 
100 00 
1-83 
2 ■ 'I'l 
1-20 
1-Jt 
•90 
1 -(19 
-C2 
