Part I., =historical=--Chapters I., Introduction.--Ii., Work Leading Up

to the Discovery of the X Rays.--III., The Discovery.

Part II., =Apparatus and its Management=--Chapters I., Electrical Terms.--II., Sources of Electricity.--III., Induction Coils.--IV., Electrostatic Machines.--V., Tubes.--VI., Air Pumps.--VII., Tube Holders and Stereoscopic Apparatus.--VIII., Fluorescent Screens.