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Updated: June 5, 2025
When the Italian naturalist Redi discovered that an exclusion of flies from meat was all that was necessary to prevent the production of grubs, the doctrine of spontaneous generation was thoroughly upset, for his time at least. But the microscope revealed in "pure" water the presence of thousands of small creatures, the infusoria.
Captain Nemo stopped, straightened up, took a few steps along the platform, and returned to me: "As for those billions of tiny animals," he went on, "those infusoria that live by the millions in one droplet of water, 800,000 of which are needed to weigh one milligram, their role is no less important.
These experiments, you see, all tended towards one conclusion that the infusoria were developed from little minute spores or eggs which were constantly floating in the atmosphere, which lose their power of germination if subjected to heat. But one observer now made another experiment which seemed to go entirely the other way, and puzzled him altogether.
It is like a drop of water seen through a microscope, a single drop teeming with infusoria; or a speck of cheese full of mites invisible to the naked eye. How we laugh as they bustle about so eagerly, and struggle with one another in so tiny a space! And whether here, or in the little span of human life, this terrible activity produces a comic effect.
Cause of the extinction of land-shells. Ascension. Variation in the imported rats. Volcanic bombs. Beds of infusoria. Bahia, Brazil. Splendour of tropical scenery. Pernambuco. Singular reef. Slavery. Return to England. Retrospect on our voyage. In the morning we passed round the northern end of Mauritius, or the Isle of France.
"In comparing the several stages in the very interesting development of the cyanæa aurita to the infusoria and polypes, it must be understood that such comparisons are warranted only by a similarity of outward form, and of the instruments of locomotion and prehension.
When the man of science shows us a drop of water in a test-tube, and tells us that this tiny drop contains more than fifteen billions of infusoria, we are subtly gratified, and cherish a secret hope that the number of infusoria is very much more than fifteen billions. In the same way, we hope that the number of seats gained by the winning party will be even greater to-morrow than it is to-day.
"I'll be hanged if I have!" cried the doctor, bringing his fist down with a tremendous thump upon the table, making one of the bottles leap up, fall over upon its side, and discharge its stopper at Rodd, who fielded it cleverly, though the contents gelatinous infusoria and spirit of wine were scattered all over the map.
DOWN, BROMLEY, KENT, June 9, 1845 I must take this opportunity of returning my sincere thanks to Mr. Bynoe, the surgeon of the Beagle, for his very kind attention to me when I was ill at Valparaiso. Porto Praya Ribeira Grande Atmospheric Dust with Infusoria Habits of a Sea-slug and Cuttle-fish St.
It is, however, a very singular fact, that, although Professor Ehrenberg knows many species of infusoria peculiar to Africa, he finds none of these in the dust which I sent him. On the other hand, he finds in it two species which hitherto he knows as living only in South America.
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