The great sorrows of my life have come upon me through the ignorance of medical men, who, I know, followed their best judgment in the course of treatment that they pursued in the illnesses of those dear to me. When my children were in their infancy I had reason to embrace the opinions of Professor Magendie, as set forth in one of his lectures before the students of his class in the Allopathic College of Paris. These are his words: "I know medicine is called a science. It is nothing like a science. It is a great humbug. Doctors are mere empirics when they are not charlatans. We are as ignorant as men can be. Who knows anything about medicine? I do not, nor do I know anyone who does know anything about it. Nature does a great deal; imagination does a great deal, doctors do d----h little when they do no harm." Later in life, in 1871, I was sent, while suffering with neurasthenia, from Paris to Schwalbach Baths by Dr. Beylard, who recommended me to the care of Dr. Adolph Genth; to whom, in my first interview, I said: "I wish for your opinion, and for your advice, if you can give it to me without prescribing any medicine." He replied: "With all my heart, Madam, and I wish to God there were more women like you; but we should soon lose our patients, if we did not dose them." A terrible excuse for the use of those agencies which Dr. John Good has said have sent more human beings to their graves than war, pestilence and famine combined. One of Mr. Keely's discoveries shapes his theory that all nervous and brain disorders may be cured by equating the differentiation that exists in the disordered structure. When his system is completed, medical men will have a new domain opened to them for experiment. Gross material agencies, such as drugs, will be replaced by the finer forces of nature: light, as taught by the late Dr. Pancoast of our city, and magnetism, as experimented with by the late Professor Keil of Jena, showing the efficacy of the ordinary magnet in the cure of certain infirmities,--these experiments were communicated by him more than fifty years since to the Royal Society of London.