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THE VASCULAR SYSTEM AND THE CIRCULATION.
28. The proofs of the circulation. Direct observation of the
circulation of the blood in the web of a frog's foot.
$1. The blood a highly complex product derived from all parts
of the body.
15. Movements of the chest walls. The intercostal muscles.
16. The diaphragm.
17. Actions of the diaphragm and intercostal muscles compared.
18. Accessory muscles.
19. Sighing, coughing, &c.
20. The chest compared to a bellows. Residual, supplemental,
complemental, tidal, and stationary air.
21. The stationary air plays the part of a middle man.
22. Composition of stationary air.
23. The respiratory mechanism under the control of the nervous
24, 25. Respiration and circulation compared.
26. The respiratory murmurs.
27. Inspiration assists the circulation.
28, 29. Effect of expiration on the circulation. Stoppage of the
heart by distension of the lungs.
30. The activity of the respiratory process modified by the
circumstances of life.
32. Respiratory poisons.
33. Slow asphyxiation.
34. Necessity for an abundance of fresh air.
THE SOURCES OF LOSS AND OF GAIN TO THE BLOOD.
§ 1. Distribution of arterial blood.
2—4. The blood in various ways meets with constant or in-
termittent gains and losses of material and heat.
5. Tabular view of the sources of loss and gain.
2. The organs of motion are cilia and muscles.
4. Muscles. Muscular contraction. Rigor mortis.
5. Hollow muscles.
6. Muscles attached to levers. The three orders of levers.
7. Examples, in the body, of levers of the first order.
8. Examples of levers of the second order.
9. Examples of levers of the third order,
10. The same parts may represent, in turn, each of the three
11. Joints or articulations. Imperfect joints.
12. Structure of perfect joints.