456 
On Phosphatic Guanos. 
Both deposits contain a high percentage of phosphate of lime, 
which mainly regulates the commercial value of these and 
similar guanos. 
Maiden Island Guano. — Maiden Island is another coral island 
in the South Pacific, upon which occur guano deposits of a con- 
siderable extent. The guano has a light-brown colour, and 
generally contains fragments of coral ; consequently its analysis 
always shows some carbonate of lime, which forms no part of 
the guano itself. It is a fine powdery phosphatic manure, and 
no doubt has been produced from the excrements of sea-birds, 
large numbers of which inhabit the island. 
The composition of Maiden Island guano varies according to 
the care which is taken in excluding fragments of the coral 
rock upon which the deposit occurs. The following analyses 
show the chemical character of recent importations. 
Composition of Malden Island Guano. 
No. 1. 
Ko. 2. 
No. 3. 
No. 4. 
No. 5. 
Ko. 6. 
Organic matter and Water'l 
of Combination . . . . / 
Magnesia, sulpliuric acid,'! 
and alkaline salts .. ../ 
Insoluble siliceous matter .. 
* Equal to tribasic phos-l 
pbate of lime .. .. / 
t Equiil to carbonate of lime 
4- 78 
5- 18 
34-75 
46-22 
3-65 
5-32 
•10 
5-39 
5- 79 
33-52 
45-16 
4-05 
6- 05 
-04 
4- 78 
5- 18 
34-75 
46-22 
3-65 
5-32 
•10 
4-56 
4-04 
35-32 
46-99 
2-85 
6-15 
-09 
9-90 
6-11 
31-36 
42-33 
4- 69 
5- 47 
•14 
5-18 
7-72 
33-39 
45-67 
4-7» 
311 
-14 
100-00 
100-00 
100-00 
100-00 
100 00 
100 -GO 
75-86 
8-29 
73-17 
9-20 
75^86 
8-29 
77-10 
6-47 
68-46 
10-66 
72-89 
10-88 
Enderhury Guano. — Enderbury Island lies south of Maiden 
Island in the South Pacific, and, like Baker and Rowland Islands, 
is a raised coral rock of limited extent, upon which the excre- 
ments of numberless birds, deprived of their solubl^e, organic, 
and saline constituents, have given rise to phosphatic deposits. 
The guano on Enderbury Island has no smell, and is of a 
light-brown or yellowish colour. It occurs partly as a fine 
powder, and partly in the shape of brown-coloured crusts, 
which by the uninitiated might be mistaken for worthless stony 
masses. 
A sample of powdery Enderbury guano, analysed by me two 
years ago, had the following composition : — 
