. American X-ray journal . nd Spanish is made by Frank Ring, A. M.,M. D., Gil Chemical Building, St. Louis. Entered at the nostoffice at St. Louis, Mo., as second-class matter. VOL. 6. ST. LOUIS, JANUARY, I900. NO. 1. CONTENTS VOL. 5 NO. 6. CONTENTS VOL. 6 NO. l. Dr. S. H. Monell. Photographs and Radiographs. Proofof Accuracy Essential to Admission asEvidence. Editorial. A Tube Holder. Dr. William Rollins. Where Is the Cathode Discharge ? Rollins. X-Ray Negation Leads to Positive Diagno-sis. Dr. Emory Lanphear. X-Rays in Medical Colleges. Answers toInquiry. Editorial. X-Ray Equipmen
. American X-ray journal . nd Spanish is made by Frank Ring, A. M.,M. D., Gil Chemical Building, St. Louis. Entered at the nostoffice at St. Louis, Mo., as second-class matter. VOL. 6. ST. LOUIS, JANUARY, I900. NO. 1. CONTENTS VOL. 5 NO. 6. CONTENTS VOL. 6 NO. l. Dr. S. H. Monell. Photographs and Radiographs. Proofof Accuracy Essential to Admission asEvidence. Editorial. A Tube Holder. Dr. William Rollins. Where Is the Cathode Discharge ? Rollins. X-Ray Negation Leads to Positive Diagno-sis. Dr. Emory Lanphear. X-Rays in Medical Colleges. Answers toInquiry. Editorial. X-Ray Equipment. Static Spark on X-Ray Plate. Roentgen Rays in Incipient Tuberculosis. Transformation of Rate Roentgen Radiation. Dr. John T. Light Tubes. Excitation of The Crookes Tube by Th<Static Machine. A Letter—Electrograph. A Fluorescent Lead. Roentgen Rays in Military Surgery. Transformation of X-Rays. Roentgen Rays in Spina Bifida. LIBRARY OF TH& COLLEGE OF PHYSICIAN pmT AnT?TPF**. JOHN TOWN SEND PITKIN, M. D. The American X-Ray Journal. Devoted to Practical X-Ray Work and Allied Arts and Sciences. VOL. 6. ST. LOUIS, JANUARY, 1899. NO. 1. X=RAY LIGHT TUBE. We illustrate here two of the x-light tubes made by Messrs. Oelling andHeinze. We can best describe these byfirst mentioning some of the observationsDr. Rollins has made in connection withx-light, in accordance with which he hasdesigned these tubes. He has shown thatfor practical purposes x-light is a hydro-gen phenomenon, the light originatingin this way: The cathode is a store-house of hydrogen, the particles of whichunder the electric stress are repelled byits concave surface, because, as shown by ish both in amplitude and frequency, forthe particles lose heat rapidly, on ac-count of their small size. As the veloc-ity depends not only upon the degree ofrepulsion between the particles and thecathode, but also upon the attraction ofthe anode, it is evident that the target onwhich they s
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