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Updated: May 2, 2025
These have all to be arranged in the body; and they are arranged by means of the membranous envelopes. Through these membranes nothing can pass that is not, for the time, in a state of aqueous solution, like water or soluble salts.
All the muscles are enveloped in membranes, and the fasciculi, or bundles and fibres of muscles, have their membranous sheathing. The brain and spinal cord are enveloped in three membranes; one nearest to themselves, a pure vascular structure, a net-work of blood-vessels; another, a thin serous structure; a third, a strong fibrous structure.
The delicate instrument thus almost completely encircles the abdomen. Underneath, on the median line, we see a long, dark-brown scale, pointed, keel-shaped, fixed by its base to the first abdominal segment, with its sides prolonged into membranous wings which are fastened tightly to the insect's flanks.
It bears no leaves, except here and there a scale, very small, membranous, and close under the branch. Lin. Spec. Plant. edit. a Reichard. Vol. I. p. 352. The Rev. T. Martyn, in his elegant letters on botany, adds, that, not content with support, where it lays hold, there it draws its nourishment; and at length, in gratitude for all this, strangles its entertainer. Let. xv.
The three semicircular canals, so called from their shape, are simply bony tubes about 1/20 of an inch in width, making a curve of about 1/4 of an inch in diameter. They pass out from the vestibule, and after bending around somewhat like a hoop, they return again to the vestibule. Each bony canal contains within it a membranous canal, at the end of which it is dilated to form an ampulla.
That we have in the primitive skull of the mammals a greatly modified and transformed organ, and not at all a primitive formation, is clear from the circumstance that its original soft membranous form only assumes the cartilaginous character for the most part at the base and the sides, and remains membranous at the roof.
The hazy semitransparency of the embryonic tissues, the halos, the granules, the globules, the cell-walls, the delicate membranous expansions, the vascular webs, are expressed with purity, softness, freedom, and a conscientiousness which reminds us of Donne's microscopic daguerreotypes, while in many points the views are literally truer to nature, just as a sculptor's bust of a living person is often more really like him in character than a cast moulded on his features.
When partially-cooked, measly pork is eaten by man, the gastric juice of the stomach dissolves the membranous sac which contains the living larva, and the animal soon passes into the intestines, where, clinging by its hooks, it holds on with wonderful tenacity, rapidly sending out joint after joint, until the perfect tapeworm sometimes attains a length of thirty feet.
When the larva is at rest, the various segments overlap evenly; and the membranous intervals, corresponding with the articulations, do not show. But, when the larva walks, all the articulations, especially those of the abdominal segments, are distended and end by occupying almost as much space as the horny arches.
Soft and boneless and formless, contained only by the dirty-white, membranous skin, it did appear a tempting target for a spear thrust. And now, sluggish with its meal, it seemed less alert and on guard. Jim went on with his thought. "I think you scientists are wrong about all the termites having intelligence," he whispered. "I believe that thing has the only reasoning mind in the mound.
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