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To my eye they looked quite smooth, although a steady oblique gaze revealed hints of concentric lines. Before the times of Leeuwenhoek I should perhaps have been unable to see more than this, although, as a matter of fact, in those happy-go-lucky days my ancestors would doubtless have trounced me soundly for wasting my time on such useless and ungodly things as butterfly eggs.
When the short period I mention had elapsed, the hand of the medium was again seized with its convulsive tremor, and she wrote, under this strange influence, a few words on the paper, which she handed to me. They were as follows: "I am here. Question me. "Leeuwenhoek." I was astounded. The name was identical with that I had written beneath the table, and carefully kept concealed.
This was more than one hundred years before Kircher, Leeuwenhoek and others began to use the microscope and to see animalcula, etc., in water, and so give a basis for the "infinitely little" view of the nature of disease germs. And it was a study of the processes of fermentation that led Pasteur to the sure ground on which we now stand. Varro, in De Re Rustica, Bk.
This fibrous construction became still more distinct to the light by adding some caustic alcali to the water; as the adhering mucus was first eroded, and the hair-like fibres remained floating in the vessel. Nor does the degree of transparency of the retina invalidate this evidence of its fibrous structure, since Leeuwenhoek has shewn, that the crystalline humour itself consists of fibres. Arc.
Von Leeuwenhoek discovered that "in the white matter between his teeth" there were millions of microscopic "animals" more, in fact, than "there were human beings in the united Netherlands," and all "moving in the most delightful manner."
And it should be recalled that Antony von Leeuwenhoek, whose death took place shortly before Newton's, had discovered such micro-organisms as bacteria, had seen the blood corpuscles in circulation, and examined and described other microscopic structures of the body. We have seen how Gilbert, by his experiments with magnets, gave an impetus to the study of magnetism and electricity.
The application of the microscope to anatomy in the hands of Grew, Leeuwenhoek, Swammerdam, Lyonnet, Vallisnieri, Réaurnur, and other illustrious investigators of nature of that day, displayed such a complexity of organisation in the lowest and minutest forms, and everywhere revealed such a prodigality of provision for their multiplication by germs of one sort or another, that the hypothesis of Abiogenesis began to appear not only untrue, but absurd; and, in the middle of the eighteenth century, when Needham and Buffon took up the question, it was almost universally discredited.
Pitcairne, M. Hartsoeker and numerous other very able persons share my opinion. This doctrine is also sufficiently confirmed by the microscope observations of M. Leeuwenhoek and other good observers. But it also for divers reasons appears likely to me that they existed then as sentient or animal souls only, endowed with perception and feeling, and devoid of reason.
The power and instinct of observation combined with the most consummate skill do not necessarily make a great philosophical naturalist. Leeuwenhoek had all these. They bore admirable fruits, too. We cannot but read the old man's letters to the Royal Society, written, if we remember right, after the age of eighty, with delight and admiration.
An old Dutch microscopist, Anton von Leeuwenhoek, in 1675, while studying with lenses of his own manufacture, discovered and described forms which undoubtedly belong to this genus. A, B, Megastoma entericum, C, Balantidum entozoon.
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