. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . 10. Fig 305—Tracings of respiratory movements of individuals belonging to differentgroups Of the animal kingdom (afterThanhoffer). Differences in depth, frequency,and especially regularity, are very noticeable. 1, fish; 2, tortoise; 3, adder (nvwinter); 4, boa-constrictor (in summer); 5, frog; 0, alligator; 7, lizard; 8, canary-bird; 0. adult dog; 10, rabbit; 11, man; 12, dog; 13, horse. Compare these, andnote that in nl respiration is shallow, and in ml deep. THE RESPIRATORY SYSTEM. 3
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . 10. Fig 305—Tracings of respiratory movements of individuals belonging to differentgroups Of the animal kingdom (afterThanhoffer). Differences in depth, frequency,and especially regularity, are very noticeable. 1, fish; 2, tortoise; 3, adder (nvwinter); 4, boa-constrictor (in summer); 5, frog; 0, alligator; 7, lizard; 8, canary-bird; 0. adult dog; 10, rabbit; 11, man; 12, dog; 13, horse. Compare these, andnote that in nl respiration is shallow, and in ml deep. THE RESPIRATORY SYSTEM. 381 If, in the tracing, the small waves on the upper part of theexpiratory curve really represent the effect of the heart-beat,it makes it easier to understand how such might assist in venti-lating the blood when the respirations occur only once in aconsiderable interval and very feebly then, as in hibernatinganimals or individuals that have fainted ; though it must beremembered that diffusion is a ceaseless process in all livingvertebrates.
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