What has the cleanliness of the body to do with the health of the lungs?—­“If the body is not kept clean, the perspiratory pores become clogged.”

What happens when the perspiratory pores are clogged?—­“The impure particles which should pass through them stay in the body, and cause disease in the lungs or other parts.”

Why should you sit and stand erect?—­“Because, if I am in the habit of stooping, my lungs will be crowded, and will not have enough room to move freely.”

Why should you keep all parts of the body warm?—­“Because chilling any part of the body causes the blood to chill in that part, and thus hinders its circulation.”

Why should you not change your winter clothing too early in the spring of the year?—­“I may take cold if not warmly clothed during the cool days of early spring.”

Why should you avoid draughts of cool air?—­“Because the cool air blows upon some parts of the body and closes the pores of the skin, checking the perspiration, and hindering the circulation of the blood.”

Why should you not rush suddenly from a warm to a cool place?—­“Because when warm the pores of the skin are open; if I rush suddenly into the cool air, these pores are closed too quickly.”

Why does stopping the perspiration hurt the lungs more or less?—­“The impurities it ought to carry away remain in the body, make the blood impure, and produce disease in some part; very often that part is the lungs.”

What harm does alcohol do in the lungs?—­“It fills the lungs with impure blood.”

What harm does it do to the air-cells?—­“It hardens the walls of the air-cells of the lungs.”

What harm is done by the hardening of these air-cells?—­“1.  The lungs cannot take in enough of the gas called oxygen to purify the blood perfectly. 2.  The gases or vapors in the lungs cannot pass freely through the hardened air-cells.”

What happens from this?—­“The lungs become diseased.”

From what disease do some hard drinkers suffer?—­“Alcoholic consumption, for which there is no cure.”  See Appendices on Alcohol and Tobacco.

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[Illustration:  THE DIGESTIVE ORGANS.]

1.  The upper jaw. 2.  The lower jaw. 3.  The tongue. 4.  The roof of the mouth. 5.  The food-pipe. 6.  The windpipe. 7, 8.  Where the saliva is made. 9.  The stomach. 10.  The liver. 11.  Where the bile is made. 12.  The duct through which the bile passes to the small intestine. 13.  The upper part of the small intestine. 14.  Where the pancreatic juice is made. 15.  The small intestine. 16.  The opening of the small into the large intestine. 17-20.  The large intestine. 21.  The spleen. 22.  The spinal column.

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PART X.

FORMULA FOR THE DIGESTIVE ORGANS AND DIGESTION.

1.  When my food is chewed, it is rolled by my tongue into the oesophagus, or food-pipe, which is back of my windpipe, and leads from my mouth down along the side of my spine, to the left and upper end of my stomach.