As before said, the brain is the seat of all sensation; and our patients, no matter how nervous they are, if the brain is properly stimulated, cannot faint--caused by the extraction of teeth. When my patients are known to be pregnant, I always use the stimulant above described before performing any painful operation; it always prevents any severe shock of the nervous system when in this condition. If any one wishes to know how to prepare the Essence, it is as follows: To one pint of alcohol add one ounce of the Oil of Gaultheria, commonly called Wintergreen. Shake it well and it is fit for use. In passing from a conscious to an unconscious state, all the Clairvoyants I have questioned on the subject say it is affected by a change of polarity of the sensatory organs, and the principle is the same whether caused by animal magnetism, syncopy or anæsthetic agents, and if only the voluntary organs are affected thereby, there is no danger to life, but if polarity in the involuntary is reversed, the heart ceases to beat and death is instantly the result. I was the first in this city to administer ether for the purpose of extracting teeth without pain. In a few cases it developed paroxysms of hysteria; otherwise no harm was done. I have administered ether, chloroform and gas to over two thousand persons. With chloroform, I had three cases that barely escaped death in my chair; with gas, some after deleterious effects followed in two cases. Admitting man's physical organization to be a magnetic machine, the deaths that have occurred are easily explained, when caused by these powerful drugs. The voluntary organs are under the control of the will, and during our waking hours there is a constant draft on our magnetic supply; it is best recuperated by sleep, when the will is at rest.