The tissues of the animal body as well as those of the vegetable are made up chiefly of water. The quantities of water found in the principal tissues of the human body are as follows:1

Percent

In the blood

corpuscles.................

55.00

whole blood 76.00

serum.....................

90.00

In the muscles...........................

76.00

In the fat...............................

8.00

In the bones.............................

14-44

In the brain and nerves..................

70-77

In the hair..............................

5.00

In the nails..............................

5.00

The average percentage of water in the body may be given as approximately 73 percent. In a man of average weight - 150 pounds - there is an average of no pounds of water. The importance of water as a food is at once evident.