. Studies in animal life . Zoology; Nature study. 26 STUDIES IN AJSTIMAIj LIFE. fully remove a drop of the liquid found inside, which, on being brought under a microscope, we shall most probably find containing some animal- cules, especially those named Monads. These were not swallowed. They live in the cerebro-spinal fluid, as the Opalina lives in the digestive tube. ISTay, if we extend our researches, we shall find that various organs have their various parasites. Here, for instance, is a parasitic worm from the frog's bladder. Place it under the microscope with a high power, and behold! It
. Studies in animal life . Zoology; Nature study. 26 STUDIES IN AJSTIMAIj LIFE. fully remove a drop of the liquid found inside, which, on being brought under a microscope, we shall most probably find containing some animal- cules, especially those named Monads. These were not swallowed. They live in the cerebro-spinal fluid, as the Opalina lives in the digestive tube. ISTay, if we extend our researches, we shall find that various organs have their various parasites. Here, for instance, is a parasitic worm from the frog's bladder. Place it under the microscope with a high power, and behold! It is called Polystomum— many-mouthed, or, more properly, many-suckered, You are looking at the un- der side, and will observe six large suckers with their starlike clasps (e), and the homy, instrument (/) with which the animal bores its way. At a there is anoth^ er sucker, which serves also as a mouth; at b you perceive the rudiment of a gullet, and at d the repro- ductive organs. But pay attention to the pretty branchings of the digestive tube (c), which ramifies through the body like a blood-vessel. This arrangement of the digestive tube is found. —Polystomum IwTEaE MPM, 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 Lewes, George Henry, 1817-1878. New York : Harper
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