ILLUSTRATIONS 



FIG. PAGE 



1. Diagram of osmometer 5 



2. Hematocrite 7 



3. Plasmolysis in cells from Tradeseantia discolor 9 



4. Apparatus for measurement of the depression of freezing point of solution . 11 



5. Diagram of conductivity cells 18 



6. Wheatstone Bridge for the measurement of electric resistance 18 



7. Diagram to show type of electrodes used in studying electromotive force . . 30 



8. Diagram of apparatus for the measurement of the H-ion concentration . . 31 



9. Chart of tints as used in colorimetric measurement of H-ion concentration 



(Color Plate) 34 



10. Diagram of apparatus for saturating blood and plasma with expired air . . 43 



11. Van Slyke's apparatus for measuring the CO 2 -combining power of blood in 



blood plasma 44 



12. Ultramicroscope (slit type) for the examination of colloidal solutions ... 53 



13. To show diffusion into gelatin of a crystalloid stain, and the nondiffusion of a 



colloid stain 54 



14. Diagram from W. Ostwald showing the relative size of various particles and 



colloidal dispersoids compared with a red blood corpuscle and an anthrax 



bacillus 55 



15. Capillary analysis of colloids 57 



16. Diagram to show structure of gels 62 



17. Diagram to illustrate surface tension 65 



18. Traube's stalagmometer 66 



19. Diagram of the graphic coagulometer 110 



20. Coagulometer 110 



21. Mercury manometer and signal magnet, arranged for recording the mean ar- 



terial blood pressure in a laboratory experiment 126 



22. The arterial blood pressure recorded with a mercury manometer (lower trac- 



ing) along with a tracing of the respiratory movement of the thorax . 127 



23. Hiirthle's spring manometer 128 



24. Normal curve of arterial blood pressure obtained with spring manometer . . 128 



25. Diagram based on experiments on dogs to show the systolic, diastolic and 



mean blood pressures at different parts of the circulatory system . . . 129 



26. Apparatus for measuring the arterial blood pressure in man 131 



27. Effect of cutting the vagus nerve on the arterial blood pressure 136 



28. Effect of stimulating the peripheral end of the right vagus on the arterial 



blood pressure 136 



29. Effect of stimulation of the left splanchnic nerve on the arterial blood pressure 137 



30. Composite curves to show effects of hemorrhage and transfusion of various 



solutions on blood pressure 140 



31. Diagram of experiment to show that the diastolic pressure depends on the 



elasticity of the vessel wall 144 



32. Diagram of Wiggers' optical manometer 147 



