. General physiology; an outline of the science of life. . Fig. 129.—/. Engelmann's gas-chamber. An annular space is closed below by a glass plate and above by a metal cover, the latter having in its middle a cover-glass for the examination of a hanging drop ; a^a', are tubes that open into the cavity of the ring and serve to heat the latter by convejung through it warm water ; h^h' are tubes that open into the glass-covered chamber and serve for the passage of the gas ; the drop hanging upon the cover-glass with its living contents is bathed by the gas in the chamber. //. Arrangement of the e
. General physiology; an outline of the science of life. . Fig. 129.—/. Engelmann's gas-chamber. An annular space is closed below by a glass plate and above by a metal cover, the latter having in its middle a cover-glass for the examination of a hanging drop ; a^a', are tubes that open into the cavity of the ring and serve to heat the latter by convejung through it warm water ; h^h' are tubes that open into the glass-covered chamber and serve for the passage of the gas ; the drop hanging upon the cover-glass with its living contents is bathed by the gas in the chamber. //. Arrangement of the experiment for in- vestigation in pure hydrogen, a, Kipp's apparatus for the preparation of hydrogen ; 6, two wash-bottles for purifying the hydrogen ; c, microscope, upon which is the gas-chamber con-» taining the hanging drop. the most sensitive to absence of oxygen. Hence without oxygen the higher vertebrates, in which the movements of respiration, the activity of the heart, etc., are dependent upon the cells of the nerve-centres, perish very soon with violent phenomena of stimu- lation. Other kinds of cells, however, continue to live for a considerable time even in a medium wholly free from oxygen. By the use of hydrogen, a gas absolutely indifferent to the organism, oxygen may be readily and completely excluded with- out introducing into the experiment other harmful factors. Since in a closed space atmospheric air, in which oxygen is the sole. 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 Verworn, Max, 1863-1921; Lee, Frederic S. (Frederic Schiller), 1859-1939. London, Macmillan and co. , limited; New York, The Macmillan company
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