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Updated: July 5, 2025
At the time of Needham's experiments it had long been observed that when animal or vegetable matter had lain in water for a little time long enough for it to begin to undergo decomposition the water became filled with microscopic creatures, the "infusoria animalculis."
In the cliffs south of the river, there is, also, a thin layer of nearly similar nature, but finer grained, and not so white; it might easily have been mistaken for a calcareous tuff, but it contains no lime: this substance precisely resembles a most widely extended and thick formation in Southern Patagonia, hereafter to be described, and which is remarkable for being partially formed of infusoria.
Bahia Blanca; M. Hermoso, bones and infusoria of; P. Alta, shells, bones, and infusoria of; co-existence of the recent shells and extinct mammifers. Buenos Ayres to Santa Fe. Skeletons of Mastodon. Infusoria. Inferior marine tertiary strata, their age. Horse's tooth. BANDA ORIENTAL. Superficial Pampean formation.
Ehrenberg has found African and even American infusoria in dust transplanted by winds and let fall in Europe, and Schliemann offers that the quantity of dust brought by the scirocco from Africa is so great, that by cutting holes in the naked rocks of Malta enough of Libyan transported earth can be caught and retained, in the course of fourteen years, to form a soil fit for cultivation.
"Yes, my boy, and don't even try to compute the number of these infusoria. You won't pull it off, because if I'm not mistaken, certain navigators have cruised through milk seas for more than forty miles." I'm not sure that Conseil heeded my recommendation, because he seemed to be deep in thought, no doubt trying to calculate how many one-fifths of a millimeter are found in forty square miles.
The inquiry once begun was followed up; other specimens of dust were submitted to the same critical test, and found generally to contain a much greater number and variety of infusoria than the first mostly fresh-water forms, but with a few of marine origin; whence the conclusion, that they had been brought from a coast-region; and especially remarkable was the fact, that among all the forms there was not one peculiar to the African continent.
Instead of such a mass of dead protein, however, take a particle of living protein one of those minute microscopic living things which throng our pools, and are known as Infusoria such a creature, for instance, as an Euglena, and place it in our vessel of water.
The millions of infusoria or of aphides which, by sub-division or gemmation, have proceeded from one individual; the countless plants which have been successively propagated from one original plant by cuttings or tubers; are, in common with the highest creature, primarily descended from a fertilized germ.
H. J. Carter, the celebrated microscopist, that the very lowest embryos, such as the myxomycetes, manifest a will and desires and preferences; and that infusoria, which apparently have no organism whatever, give evidence of a certain cunning.
In the case of the prawn-like crabs, their movements were as coinstantaneous as in a regiment of soldiers; but this cannot happen from anything like voluntary action with the ovules, or the confervae, nor is it probable among the infusoria. Secondly, what causes the length and narrowness of the bands?
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