| Sir Robert Hermann Schomburgk - 1848 - 772 Seiten
...circumstance they received the name of Polygastrica. Professor Grant asserts that nearly five hundred millions are contained in a single drop of water,...many as there are individuals of our own race on the earth ; and it is most surprising, that though so minute, the majority possess eyes, have an acute... | |
| 1848 - 556 Seiten
...infusoria with siliceous shields, and that Professor Grant asserts that nearly 500,000,000 of polygastrica, that is, as many as there are individuals of our own race on the earth, are contained in a single drop of water; we are not more filled with wonder at the immeasurable... | |
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