If you were to breathe desert air, or the air of a blast furnace heated to 130 degrees--this superheated air would be cooled approximately to body temperature before it was passed into the lung cells. If there is a tendency to breathe through the mouth, this will be manifested most decidedly at night, when you are asleep, and the muscles are relaxed. If you find that you are in the habit of sleeping with the mouth open--awakening in the morning with a dry, harsh throat, it might be well to adopt the device which Dr. William H. Fitzgerald introduced to the medical profession almost 20 years ago. This consists merely in applying a small piece of surgeon’s adhesive plaster over the closed lips, keeping them closed during all the hours of the night. The court-plaster can be applied lengthwise over the lips; or it can be pasted across the lips, holding them firmly in the closed position. Many find the latter method the most practical. The more fresh air you can get in your home, your office or school or workshop, or wherever you may have to spend your day time--the better off you’ll be. TRANSCRIBER’S NOTES: Italicized text is surrounded by underscores: _italics_. Emboldened text is surrounded by equals signs: =bold=. Obvious typographical errors have been corrected. References are made in the text to photographs, although no photographs appear in the original. End of the Project Gutenberg EBook of The New Science of Controlled Breathing, Vol. 2 (of 2), by Edward Lankow