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Updated: May 9, 2025
For by the same reasoning about the hollow sphere which I have employed to prove the smallness of the density of glass and its easy penetrability by the ethereal matter, one might also prove that the same penetrability obtains for metals and for every other sort of body.
Because on the quicksilver and the water quitting the upper part of the glass tube, it appears that it is immediately filled with ethereal matter, since light passes across it. But here is another argument which proves this ready penetrability, not only in transparent bodies but also in all others.
It appears from the things explained above that the progression or propagation of a small part of a wave of light is properly what one calls a ray. Now these rays, instead of being straight as they are in homogeneous media, ought to be curved in an atmosphere of unequal penetrability.
Every crime I had traced, however cleverly perpetrated, was from the point of view of penetrability a weak failure. Traces and trails were left on all sides ragged edges, rough-hewn corners; in short, the job was botched, artistic completeness unattained.
I. Of material and immaterial beings. Doctrine of St. Paul. Of the sense of touch. Of solidity. 2. Of figure. Motion. Time. Place. Space. Number. 3. Of the penetrability of matter. 4. Spirit of animation possesses solidity, figure, visibility, &c. Of Spirits and angels. 5. The existence of external things. III. Of vision. IV. Of hearing. V. Of smell and taste.
Soon after her completion, "compound" armour plates, with a hard steel face on a backing of wrought-iron were introduced, which enabled a third of the weight of the armour to be saved, yet leaving the amount of penetrability unchanged.
And in proportion as it is compressed the more does it exert an effort to regain its volume; for this property along with its penetrability, which remains notwithstanding its compression, seems to prove that it is made up of small bodies which float about and which are agitated very rapidly in the ethereal matter composed of much smaller parts.
We shall demonstrate hereafter that by this process the same penetrability may be inferred also as relating to opaque bodies. The second mode then of explaining transparency, and one which appears more probably true, is by saying that the waves of light are carried on in the ethereal matter, which continuously occupies the interstices or pores of transparent bodies.
What they failed to acknowledge was his point of view and this he was wise enough not to press at dinner tables and in drawing-rooms that religion should have the penetrability of ether; that it should be the absorbent of life.
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