. Plexus. SEND US YOUR CARD AND WATCH THE EFFECTTHE ANTIKAMNIA CH1EMICAL COMPANY—r- ST. LOUIS, TRUAX, GREENE & CO., l^hysicians9 and. HospitalSupplies, Surgical Instrvuncnts. The largest and most complete Physicians Supply Housein the World! TRUAX, GREENE & CO., 46 WABASH AVENUE, Bet. Lake and Randolph Streets. WM A. FISHER, M. D., Pres. JOHN R. HOFFMAN, M. D., Sec A. G. WHIPPLE, M. D., Vice Pres. Chicago Eye, Ear, Nose and Throat College. A Clinical School for Practitioners of Medicine. Equipment unexcelled. Abundant material. Clinical instruction. Coursesone month in duration. Practit


. Plexus. SEND US YOUR CARD AND WATCH THE EFFECTTHE ANTIKAMNIA CH1EMICAL COMPANY—r- ST. LOUIS, TRUAX, GREENE & CO., l^hysicians9 and. HospitalSupplies, Surgical Instrvuncnts. The largest and most complete Physicians Supply Housein the World! TRUAX, GREENE & CO., 46 WABASH AVENUE, Bet. Lake and Randolph Streets. WM A. FISHER, M. D., Pres. JOHN R. HOFFMAN, M. D., Sec A. G. WHIPPLE, M. D., Vice Pres. Chicago Eye, Ear, Nose and Throat College. A Clinical School for Practitioners of Medicine. Equipment unexcelled. Abundant material. Clinical instruction. Coursesone month in duration. Practitioners may enter at any time. Equal advantagesthe year round. Write for catalogue and information to JOHN R. HOFFMAN, Secretary, Trude Bldg., 67 Wabash Ave., L,. HARRISON METTLER, M. of Physiology of the Nervous of Physicians and Surgeons, Chicago. THE PLEXU THE OFFICIAL ORGAN OF THE COLLEGE OF PHYSICIANS AND SURGEONS MEDICAL DEPARTMENT OF THE UNIVERSITY OF ILLINOIS, VOL. VI. SEPTEMBER 20th, 1900. NO. 5. MYELINATION AND Harrison Mettler, A. M., M. D. Professor of Physiology of the Nervous System in College of Medicine,University of Illinois. The relationship between mind and matter is still largely asubject of speculation. Metaphysicians have analyzed the mindand anatomists have dissected the brain; but in spite of ourincrease of knowledge, we cannot yet say how the material brainproduces mental phenomena. Between the gross materialismwhich declares mind to be a product of brain activity the sameas bile is the product of the liver, and the spiritualistic ortranscendental notion which pictures the relationship of mindand brain as somewhat similar to that of a ray of light glintingthrough a rent in


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