Human Hair.
It has been estimated that a single square inch of the scalp—the skin of the head—contains about seven hundred and forty-four hairs. This number, multiplied by one hundred and twenty square inches—the surface of the head—gives us eighty-nine thousand two hundred and eighty as the number of the hairs of the head. If a lady's hair is a half-yard in length, she will have one hundred and thirty three thousand nine hundred and twenty feet of hair. A man who has arrived at the age of fifty years will have lost, by hair cutting, about thirteen feet, which, multiplied by the number of hairs (eighty-nine thousand two hundred and eighty), will amount to one million one hundred and sixty thousand six hundred and forty feet of hair tubing, or about two hundred and twenty miles.