127. Sciagraphs. Duration of Exposure EDISON Dependent upon Distances. 128. Differences between X-rays and Light EDISON, FROST, Illustrated by Different Photographic CHAPPIN, Plates. Times of Exposure. IMBERT, BERTIN-SANS, and MESLIN 128_a_. GEORGES MESLINS INSURED A REDUCTION OF TIME FOR TAKING SCIAGRAPHS BY THE DEFLECTION OF THE CATHODE RAYS BY MEANS OF A MAGNETIC FIELD 129. Size of Discharge Tube to Employ for EDISON Given Apparatus. 130. Preventing Puncture at the EDISON Phosphorescent Spot. 131. Instruction Regarding the Electrical EDISON and Apparatus. PUPIN 132. Salts Fluorescent by X-rays. 1800 EDISON Chemicals Tested. 133. X-rays Apparently Passed around a EDISON, ELIHU Corner. Theoretical Consideration by THOMSON, Himself and Others. ANTHONY, _et al._ 134. Permeability of Different Substances to EDISON and X-rays. A List of a Variety of TERRY Materials. 134_a_. Illustration of Penetrating Power of HODGES Light. 135. Penetrating Power of X-rays Increased EDISON by Reduction of Temperature. Tube Immersed in Oil, and the Oil Vessel in Ice. X-rays Transmitted through Steel 1/8 in. Thick. 136. X-rays Not Obtainable from Other EDISON, ROWLAND, Sources than Discharge Tube. _et al._ CHAPTER XI. 137. Kind of Electrical Apparatus for TESLA and Operating Discharge Tube for Powerful SHALLENBERGER X-rays. 138. How to Maintain the Phosphorescent Spot TESLA Cool. 139. Expulsion of Material Particles through TESLA the Walls of a Discharge Tube. 139_a_. Giving to X-rays the Property of Being LAFAY and Deflected by a Magnet. LODGE 139_b_. Penetration of Molecules into the Glass GOUY of the Discharge Tube. 140. Vacuum Tubes Surrounded by a Violet TESLA and Halo. HAMMER 141. Anæsthetic Properties of X-rays. TESLA and EDISON