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Moisture on the shell may come from an external wetting, from the "sweating" of eggs coming out of cold storage, or by the prevention of evaporation to such an extent that the external moisture of the egg thoroughly soaks the membrane. The latter happens in damp cellars, and when eggs are covered with some impervious material.
On the hypothesis under which our skeptic is making his examination the eye having been completed in all but the formation of the lens the place which the lens occupies when completed was filled with parts of the humors and plane membrane, homogeneous in texture and surface, presenting, therefore, neither the variety of the materials nor forms which are contained in the optician's shop for chance to make its combinations with.
We would again call attention to one anatomical fact of great importance for the explanation of certain facts of experience viz.: that the whole respiratory tract, the larynx included, is lined with a mucous membrane, which is continuous with that covering the inner surface of the digestive organs.
He holds it to be essentially an inflammatory affection, attacking peculiarly the mucous membrane of the nose, and extending thence through the cribriform plate of the ethmoid bones to the interior part of the brain, and so giving rise to a derangement of the nervous system as a necessary consequence.
In this division, in some cases at least, the spindle fibres bear a part a fact which again points to the importance of the centrosomes and the forces which radiate from them. They now become surrounded by a membrane, so that the new nucleus appears exactly like the original one. The spindle fibres disappear, and the astral fibres may either disappear or remain visible.
The vibrations spread in every direction until they reach the delicate membrane of the tympanum of the ear. That membrane responds to the motion without, and the vibration is carried on to the pulp of the auditory nerve, deep in the recesses of the ear. The loudness of the tone its acuteness or graveness depends on the force of the expired air and the shortening or lengthening of the chord.
The fin-fringe is supported by a number of square elastic fin-plates. The chorda develops no further, but retains its original simplicity throughout life. It is enclosed by a firm membrane, the chorda-sheath or perichorda. The perichorda forms a cylindrical tube immediately over the chorda, and the central nervous system, the medullary tube, is enclosed in it.
Hence, from this point of view, the difference between animals and plants consists in this; that, in the latter, the contractile substance, as a primordial utricle, is enclosed within an inert cellulose membrane, which permits it only to exhibit an internal motion, expressed by the phenomena of rotation and circulation, while, in the former, it is not so enclosed.
This illustration will explain how the odor of different substances is frequently perceptible in the breath long after the mouth is free from them. The lungs not only exhale waste matter, but absorption takes place from their lining membrane. In both of these respects there is a striking analogy between the functions performed by the lungs and the skin.
If this is not done, the dry and over-heated air, which is highly absorbent of moisture in every thing with which it comes in contact, not only creates a disagreeable sensation of dryness on the surface of the body, but in passing over the delicate membrane of the throat, creates a tickling, induces a cough, and lays the foundation for pulmonary disease, especially when ventilation is neglected.
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