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50. Retinal image, 210 51. Different shapes of the globe of the eye, 212 52. Function of accommodation, 214 53. Diagram of the ear, 218 54. Section of the ear, 221 55. Section of larynx and trachea, 229 56. View of vocal cords by the laryngoscope, 232 57. Different positions of vocal cords, 232 58. Simple microscope, 238 59. Compound microscope, 239 60. Household microscope, 240 61. Popular microscope, 241

INTRODUCTION.

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The Human Body is the abode of an immortal spirit, and is the most complete and perfect specimen of the Creator's handiwork. To examine its structure, to ascertain the uses and modes of action of its various parts, how to protect it from injury, and maintain it in a healthy condition, is the design of this work.

The departments of knowledge which are concerned in these investigations, are the science of Human Physiology and the art of Hygiene.

Physiology treats of the vital actions and uses of the various parts of living bodies, whether vegetable or animal. Every living thing, therefore, has a Physiology. We have a Vegetable Physiology, which