. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . er path. Atthe position on the glass globe where the cathode ray im-pinged, it was noted that a most brilliant fluorescenceoccurred; but it was not until the subject was taken up byRoentgen that the discovery was made that a new kind ofray was generated at the point of impact of the cathoderay, and that this new ray possessed some remarkableproperties. The nature of the cathode ray, as the emanations fromthe negati
. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . er path. Atthe position on the glass globe where the cathode ray im-pinged, it was noted that a most brilliant fluorescenceoccurred; but it was not until the subject was taken up byRoentgen that the discovery was made that a new kind ofray was generated at the point of impact of the cathoderay, and that this new ray possessed some remarkableproperties. The nature of the cathode ray, as the emanations fromthe negatively connected pole were called, had been prettythoroughly investigated by Crookes and more fully byLenard, who amply disproved the erroneous theory ofradiant matter which had been advanced by controversy that this started among the scientific menof the time is responsible for a great deal of the investiga-tions that were carried on in that line, and eventually for APPARATUS. 57 the discovery of the Roentgen ray. The theory of Crookesis essentially that a new state of matter exists at the highdegree of attenuation which he had attained in his tubes, Fig. Fig. Crookes tube at low exhaustion Crookes tube of a higher vacuum. and the experiments that he performed to demonstrate thetruth of his conception were as ingenious as they werenumerous, and were the means of disclosing many facts 58 GENERAL CONSIDERATIONS UPON RADIOLOGY in connection with the cathode stream that were not at thetime being sought for. ■ ■ The tube that was designed and utiHzed by Roentgenhas been previously described. This was at first the formof tube that was used by almost all of the men who took upthe investigations at the beginning and worked along thelines that Roentgen had laid out. As soon as the ray wasin a condition to be demonstrated, and was found to be ofgeneral importance, Crookes tube became the most widelyused, as it was desirable to have a clear path from thecathode to the
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