. The Röntgen rays in medical work . - - 296 152. Periosteal Sarcoma (Small Round-celled) in Femur of Woman aged Twenty-four Years ------ 297 153. Foot in Leprosy showing Bone Absorption (Some of the Markings due to an Opaque Dressing) - - - 299 154. Hands in Leprosy ... - - 300 155. Charcot Knee in a Woman aged Forty-three Years - - 302 156. Bone Reproduction ------- 303 157. Skiagram of Teeth, showing Various Pathological Conditions 312 158. Half-grown Cat, showing Bronchi, Liver, Heart, etc. - 318 159. Normal Thorax ------- 322 160. Aneurism of Aorta in avhich Physical Signs were absent - 3
. The Röntgen rays in medical work . - - 296 152. Periosteal Sarcoma (Small Round-celled) in Femur of Woman aged Twenty-four Years ------ 297 153. Foot in Leprosy showing Bone Absorption (Some of the Markings due to an Opaque Dressing) - - - 299 154. Hands in Leprosy ... - - 300 155. Charcot Knee in a Woman aged Forty-three Years - - 302 156. Bone Reproduction ------- 303 157. Skiagram of Teeth, showing Various Pathological Conditions 312 158. Half-grown Cat, showing Bronchi, Liver, Heart, etc. - 318 159. Normal Thorax ------- 322 160. Aneurism of Aorta in avhich Physical Signs were absent - 326 161. Dextrocardia - - 328 162. Sinistro-Cardia - - 329 163. Thorax showing Scattered Miliary Tubercles - 334 164. Pneumothorax - - 337 165. Pyopneumothorax - - 339 166. Diagram - - - 346 167. Diagram - - - - 347, 168. f(etus from an extra-uterine fcetatiox - - 392 169. Two-headed Fcetus - - - 394 170. Injected Bloodvessels of Human Kidney - 410 171. Injected Bloodvessels of Human Heart- - 412 172. Phalanges of Horses Hoof - - 419. THE KONTGEN RAYS INMEDICAL WOEK PART I THE ELECTRICAL APPARATUSBy H. LEWIS JONES, CHAPTER IINTRODUCTORY Lenard and Rontgen—The work of Crookes—Kathode raya and electrons—Sources of current. Kathode Rays and Electrons.—The discovery of the x-rays wasmade by Rontgen at the end of the year 1895. It followed uponthe work of Lenard, who found, when experimenting with thehighly-exhausted Crookes tubes, that certain effects could beobserved outside the tube. Before that time attention had beenfixed upon the phenomena within the tube, and outside effects hadnot been noticed. Lenard, in 1894, following up a hint given tohim by Hertz, and working with tubes provided with an aluminium1 window, found that such tubes emitted radiations which could berecognised in the open air outside the window, and that these radia-tions had the power of exciting phosphorescence and fluorescence :;:in suitable bodies, and of acting upon sensitive photographic pla
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