10 



HITCHCOCK' S 



ANATOMY 



ant of them seem desir- 

 able. 



21. Oxygen. — Oxy- 

 gen is regarded as an 

 immediate principle only 

 when it exists in a free 

 state, as it does in the 

 blood, which, in an 

 adult, contains sixty- 

 one grains : nine and 

 a half cubic inches be- 

 ing found in the arte- 

 rial, and fourteen and a 

 half in the venous blood. 

 An adult consumes in a year about eight hundred pounds of 

 oxygen. An inhabitant of a mountainous region 18,000 feet 

 above the sea (in Potosi) consumes, however, only two thirds 

 as much as one upon the sea-shore. 



22. Hydrogen and Nitrogen. — Hydrogen is found in a free 

 state in the stomach and some parts of the intestines, and 

 nitrogen in the lungs, blood, and intestines. 



23. Carbonic Acid, — Carbonic acid is found in the lungs, 

 the alimentary canal, the blood, and urine. 



24. Water; Cubical Size of the Body. — Water enters into 

 the composition of every fluid, and every solid in the body. 

 The bulk of the body, upon an average, is equal to a cube of a 

 little more than sixteen inches on a side ; and the amount of 

 water equals a cube a little more than fourteen inches on a 

 side, or nearly three fourths of the body. Every part, ex- 

 cept bone, enamel, teeth , tendon, dry cuticle, and elastic tis- 

 sue, is rnose than half water. 



21. How much Oxygen by weight is found in the body? What bulk of oxygen is found 

 in the venons and what in the arterial blood ? How much does an adult consume by re- 

 spiration and otherwise in a year? What effect does elevation above the sea have upon 

 the amount consumed? 22. State how Hydrogen and Nitrogen are found. 23. Carbonic 

 acid also. 24 How important a constituent is water? Give the size of the body if re- 

 duced to a cube. If this cube were water, how large would it be ? 



Fig. 2. 



