. Elementary zoology. Zoology. BRANCH PROTOZOA: THE ONE-CELLED ANIMALS 79 cilia. Many of the familiar Protozoa of the fresh-water ponds always have two whiplash-like flagella projecting from one end of the body. By means of the lashing of these flagella in the water the tiny creature swims about. Others have many hundreds of fine short cilia scattered, sometimes in regular rows, over the body-surface. The Protozoan swims by the vibration of these cilia in the water. There is no stagnant pool, no water standing exposed in watering-trough or bar- rel which does not contain thousands of individua
. Elementary zoology. Zoology. BRANCH PROTOZOA: THE ONE-CELLED ANIMALS 79 cilia. Many of the familiar Protozoa of the fresh-water ponds always have two whiplash-like flagella projecting from one end of the body. By means of the lashing of these flagella in the water the tiny creature swims about. Others have many hundreds of fine short cilia scattered, sometimes in regular rows, over the body-surface. The Protozoan swims by the vibration of these cilia in the water. There is no stagnant pool, no water standing exposed in watering-trough or bar- rel which does not contain thousands of individuals of the one-celled animals. And in any such stagnant water there may always be found several or many dif- ferent kinds or species. A drop of this water examined with the compound micro- scope will prove to be a tiny wrorld (all an ocean) with most of its animals and plants one-celled in struc- ture. A few many-celled animals will be found in it preying on the one-celled ones. There are sudden FlG\ IO-- and violent deaths here, and. births (by fission of the parent) and active locomo- tion and food-getting and growth and all of the busi- Stentor which may be fixed, like Vorticella, or free-swimming, at will, and which has the nucleus in the shape of a string or chain of bead-like bodies. The figure shows a single individual as it appeared when fixed, with elongate, stalked body, and as it appeared when swimming about, with contracted body. (From life.) nesses and functions of life which we are accustomed to see in the more familiar world of larger Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York : H. Holt and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
