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In another section, locomotion is effected by a modification of ciliary apparatus. We have a familiar example in the Beroe of our own seas, a most attractive little being, and a prime favourite with naturalists, who have described its habits and celebrated its beauty with enthusiasm. We shall not soon forget the delight with which we first made acquaintance with this graceful little rover.
It is a forest of glass bells, on branching stalks. They are Vorticellae; and every one of those bells, by the ciliary current on its rim, is scavenging the water till a tadpole comes by and scavenges it. How many millions of living creatures are there on that one sprig? Look here! a brown polype, with long waving arms a gigantic monster, actually a full half-inch long.
In acute glaucoma the sclera appears to be edematous and slightly thickened. As the disease progresses the sclera becomes denser than normal. The oblique openings passages for the venae vorticosae are said to be narrowed. The openings for the passage of the anterior ciliary vessels are enlarged in many, particularly in advanced cases. Minute herniae at these openings are sometimes present.
And when the pharinx is irritated by agreeable food, the muscles of deglutition are brought into action by association. Thus when a greater light falls on the eye, the iris is brought into action without our attention; and the ciliary process, when the focus is formed before or behind the retina, by their associations with the increased irritative motions of the organ of vision.
It commences as a diffuse haziness or steaminess near the centre of the cornea, and as it spreads the entire cornea assumes the appearance of ground glass. The chief complaint is of dimness of sight, which may almost amount to blindness, but there is little pain or photophobia; a certain amount of conjunctival and ciliary congestion is usually present, and there may be iritis in addition.
It was I who resolved the singular problem of rotation in the cells and hairs of plants into ciliary attraction, in spite of the assertions of Wenham and others that my explanation was the result of an optical illusion. But notwithstanding these discoveries, laboriously and painfully made as they were, I felt horribly dissatisfied.
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