26
_Pabellon de Pica_ 7 9 14 31
_Punta de Lobos_ 4 5 15 33
_Huanillos_ 6 7 18 28
Penguin 5 6 11 24
Patagonian 4 5 18 39
Falkland Islands 4 5 14 31

_Phosphatic Guanos._

Phosphoric } { Tricalcic
acid } = { phosphate.
per cent. per cent.
Maracaibo, or Monks 42 92
Raza Island 40 87
Curacao 40 87
_Baker Island_ 39 85
Starbuck 38 83
_Enderbury_ 37 81
Californian 35 76
_Aves_ 34 74
Fanning Island 34 74
Howland 34 74
_Sidney Island_ 34 74
Mejillones 33 72
Lacepede Island 33 72
_Malden Island_ 32 70
Sombrero 32 70
_Browse Island_ 31 68
_Huon Island_ 28 61
Patos Island 24 52
Jarvis Island 20 44
Cape Vert 11 24

NOTE VI. (p. 314).

It may be of interest to refer to a theory put forward by Liebig as to
the action of oxalic acid in guano. This, he considered, had the effect
of gradually rendering the insoluble calcium phosphate soluble, and
giving rise to the formation of ammonium phosphate and calcium oxalate.
Such an action would probably take place were the guano allowed to
ferment by itself. We know, however, that when it is brought in contact
with the so