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This great naturalist is convinced that the spar had not been here introduced by infiltration, although that is the very method which he employs to form concretions, not only of spar but of crystal, zeolite, and pyrites, in the closest cavities of the most solid rocks of basaltes.
When it is raised, the pillars of the fauces are lowered. In its normal position it allows the pillars to be distended and to close the head cavities off from the throat, in order to produce the chest tones; that is, to permit the breath to make fullest use of the palatal resonance.
There is a stratum of limestone in Fifeshire, near Raith, which, though but slightly tinged with a black colour, contains bituminous matter, like pitch, in many cavities, which are lined with calcareous spar crystallised. I have a specimen of such a cavity, in which the bitumen is in sphericles, or rounded drops, immersed in the calcareous spar.
Pus fistula is the characteristic lesion present, and it is the result of a suppurative inflammation of the tissues in the region. The abscess cavity or cavities are usually deep, and may involve the ligaments and vertebrae. Bruises or contusions are the most common causes. The prominence of these regions predisposes them to injury in the stable, or when rolling on rough or stony ground.
Neither is it by any means to be allowed that the heart only moves in the lines of its straight fibres, although the great Vesalius giving this notion countenance, quotes a bundle of osiers bound in a pyramidal heap in illustration; meaning, that as the apex is approached to the base, so are the sides made to bulge out in the fashion of arches, the cavities to dilate, the ventricles to acquire the form of a cupping-glass and so to suck in the blood.
The 'heart' is composed of four cavities; two above, called 'auricles', from their shape, and two below, termed 'ventricles', occupying the bulk of the heart.
By creeping into the cavities opened we were able to ascertain that the chambers in this mound were similar to those in the mound we had opened, only they were double on both stories, and the upper story was also coated with cement. Two chambers ran parallel to each other, and were joined at the two extremities.
By compressed air you blow out the old decayed mortar, and then damping the masonry by the injection of water, you insert the nozzle of the machine and force the grout into the cracks and cavities, and soon the whole mass of decayed masonry is cemented together and is as sound as ever it was.
The complication of the organ increases; cavities termed ventricles are formed, which do not exist in fishes, reptiles, or birds; curiously organized parts, such as the corpora striata, are added; it is now the brain of the mammalia. Its last and final change alone seems wanting, that which shall render it the brain of MAN." And this change in time takes place. So also with the heart.
Nothing in natural history appears more worthy the consideration of the learned world, than does this repository of petrefactions, so uncommon that scarcely any thing except the testimony of one's own eyes could convince one that flying fish, natives, and intending to remain inhabitants, of the Pacific Ocean, are daily dug out of the bowels of Monte Bolca near Verona, where they must doubtless have been driven by the deluge, as no less than omnipotent power and general concussion could have sufficed to seize and fix them for centuries in the hollow cavities of a rock at least seventy-two miles from the nearest sea.
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