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This membrane is ciliated, that is, it is studded with tiny hairlike projections, extending into the air passages. These are constantly in motion, much like the grain in a field when the wind is gently blowing. Their function is to prevent the entry of foreign particles into the air cells, for their propulsive motion is away from the lungs, toward the external air passages.

In the alimentary apparatus there are the thymus-gland and the thyroid gland, the seat of goitre and the relic of a ciliated groove that the Tunicates and Acrania still have in the gill-pannier; there is also the vermiform appendix to the caecum.

Originally alike all over its surface, the hollow sphere of ciliated units thus formed, would, if not quite spherical, assume a constant attitude when moving through the water; and hence one part of the spheroid would more frequently than the rest come in contact with nutritive matters to be taken in.

He sat to the last moment doggedly struggling to keep cool and to mount the ciliated funnel of an earthworm's nephridium. But ciliated funnels come not to those who have shirked the laboratory practice.

The young girl uttered a cry of childish delight, as the soft ciliated fibres touched her sensitive skin. "It is healing, too," continued Low; "a moccasin filled with it after a day on the trail makes you all right again." But Miss Nellie seemed to be thinking of something else. "Is that the way the squaws bathe and dry themselves?" "I don't know; you forget I was a boy when I left them."

They strain off matters held in suspension in the water, by means of their siphons and ciliated gills. With these precautions, a well-balanced tank will long retain all the pristine purity of Nature. Specimens for the river aquarium may be readily obtained in almost any brook or pool, by means of the hand-net or dredge.

The free-swimming embryo of an aquatic annelid, being ovate and not ciliated all over, moves with one end foremost; and its differentiations proceed in conformity with this contrast of circumstances.

From hence all faecal and other matter is discharged through the oscula, the larger openings observed on the surface of the sponge. Dr. Ledenfeld showed the different parts of sponges by means of microscopic slides thrown on to a screen, and also the shape and arrangement of the chambers in different species. The ciliated chambers especially attracted attention.

Now, if you expect me to hold forth in a "scientific" way about my tree-loves, to talk, for instance, of the Ulmus Americana, and describe the ciliated edges of its samara, and all that, you are an anserine individual, and I must refer you to a dull friend who will discourse to you of such matters.

A medusa begets a ciliated larva, the larva begets a polyp, the polyp begets a strobila, and the strobila begets a medusa again; the cycle of reproduction being completed in the fourth generation. A frog lays an egg, which egg becomes a tadpole; the tadpole, after more or fewer intermediate stages, becomes a frog.