File:A text-book of physiology, for medical students and physicians (1907) (14591605778).jpg

Identifier: textbookofphysio1907howe (find matches)
Title: A text-book of physiology, for medical students and physicians
Year: 1907 (1900s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology Physiology
Publisher: Philadelphia, London, W.B. Saunders Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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ill be condensed at it- upper end, and by turning the stopcock m properly these may be forced to the oul ide bj way of C or may be collected, if de- ♦ Taken from Bergey, The Principles of Hygiene, 1904. CHANGES IN AIR AND BLOOD IN RESPIRATION. 649 sired, in a burette filled with mercury and inverted over the opening fromF contained in the bottom of C. In performing an experiment the flaskB, which is to contain the blood, is connected with F, as shown in the figure,all joints being protected from leakage by a seal of water outside, as shownat h, which represents a piece of wide rubber tubing filled with water so asto protect a joint between two pieces of glass tubing. B is next exhaustedcompletely by raising and lowering M a number of times in the Avay describedabove until on throwing B into communication with a vacuum in F no furthergas is given off. The last particles of air may be driven out from B by boil-ing a little water in it. After a complete vacuum has been established in B
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Fig. 264.—Gas pump for extracting the gases of blood (Grehant): M and F,The mercury receivers; P, the windlass for raising and lowering M; m, a three-waystopcock protected by a seal of mercury or water; C, a cup with mercury over whichthe receiving eudiometer is placed to collect the gases; B, the bulb in which, after avacuum is made, the blood is introduced by the graduated syringe, S. By means of thestopcock m the vacuum in F, caused by the fall of the mercury, can be placed in communi-cation with B. After the gases have diffused over into F, M is raised, and when the stop-cock m is properly turned these gases are driven out through C into the receiving tube.The operation is repeated until no more gas is given off from B. a measured amount of blood is introduced from a graduated syringe, S, asrepresented in the figure. This blood must be taken directly from the vesselsof the animal and be introduced into B at once. B is kept immersed in waterat the temperature of the body, and the

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