. Evenings at the microscope : or, researches among the minuter organs and forms of animal life. Microscopy; Microscopes; Medical microscopy. ePIEACLE OF LEATHEE-COAT. geographical simile, we may saj that, instead of being an island in the midst of a lake, it is a promontory. Thus, the breathing space is a crescent-shaped band, which is crossed in every part by bars passing from the margin to the projecting plate. But, as if the interstices left by these bars would be too coarse for the pui-- pose, they are further sublimat- ed by a membrane, which is stretched across them, and which is perfor
. Evenings at the microscope : or, researches among the minuter organs and forms of animal life. Microscopy; Microscopes; Medical microscopy. ePIEACLE OF LEATHEE-COAT. geographical simile, we may saj that, instead of being an island in the midst of a lake, it is a promontory. Thus, the breathing space is a crescent-shaped band, which is crossed in every part by bars passing from the margin to the projecting plate. But, as if the interstices left by these bars would be too coarse for the pui-- pose, they are further sublimat- ed by a membrane, which is stretched across them, and which is perforated with a num- ber of excessively minute roiind holes, through Avhich alone the air is admitted. In many of the two-winged flies, which inhabit the water in their earlier stages, there are some interesting contrivances and modifica- tions connected with the or- gans of respiration. It is ne- cessary that the orifices of the air-tubes should be brought at intervals to the surface of the water, in or- der to come into contact with the external air; while, at the same time, it is im- portant that as small a por- tion as possible of the ani- mal's body be exposed to danger, by being protruded from its sheltering element. An example in point you may see in this vase. Here is a slender worm, an inch and a half in. 6PIRACLE OF 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 Gosse, Philip Henry, 1810-1888. New York, D. Appleton
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