26. Observation by the auscultatory method and a dial instrument 85 27. Schema to illustrate decrease in pressure 86 28. Chart showing the normal limits of variation in systolic blood pressure 89 29. Tracing of auscultatory phenomena 94 30. Tracing of auscultatory phenomena 95 31. Clinical determination of diastolic pressure, fast drum 96 32. Clinical determination of diastolic pressure, slow drum 96 33. Venous blood pressure instrument 121 34. New venous pressure instrument 122 35. Events in the cardiac cycle 124 36. Simultaneous tracings of the jugular and carotid pulses 125 37. Jugular and carotid tracings 125 38. Right side of the heart showing distribution of the two vagus nerves 127 39. Normal electrocardiogram 128 40. Auricular flutter 132 41. Auricular fibrillation 134 42. Auricular fibrillation 134 43. Pulse deficit 135 44. Ventricular fibrillation 137 45. Auricular extrasystoles 139 46. Ventricular extrasystole 139 47. Delayed conduction 141 48. Partial heart block 141 49. Complete heart block 142 50. Alternating periods of sinus rhythm and auriculoventricular rhythm 144 51. Auriculoventricular or "nodal" rhythm 144 52. Influence of mechanical pressure on the right vagus nerve 144 53. Schematic distribution of right and left vagus 145 54. Blood pressure record from a normal reaction to ether 149 55. Chart showing the method of recording blood pressure during an operation 150 56. Method of using blood pressure instrument during operation 151 57. Finger-tip palpation of the radial artery 178 58. Finger-tip palpation of the radial artery 178 59. Aneurysm of the heart wall 196 60. Large aneurysm of the aorta eroding the sternum 198 ARTERIOSCLEROSIS AND HYPERTENSION CHAPTER I ANATOMY