The Bat Guanos of Porto Rico and Their Fertilizing Value (Classic Reprint) - Softcover

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Excerpt from The Bat Guanos of Porto Rico and Their Fertilizing Value

As the composition of guanos depends more on the leaching, etc. To which. They have been exposed than on the composition of the original substance, many of these deposits are similar to certain phosphatic guanos formed by sea birds. The individual deposits originating from sea birds, however, are much the larger, for although both birds and bats congregate in immense numbers, the birds con sume much more food.

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