B.Sc. (Lond.), F.I.C., Member of the Roentgen Society of London; Radiographer to St. George's Hospital; Demonstrator of Physics and Chemistry, and Teacher of Radiography in St. George's Hospital Medical School. Demy 8vo. 12 Plates from Photographs of X Ray Work. 52 Illustrations. 200 pp. 1901. Price 10s. 6d.; India and Colonies, 11s.; Other Countries, 12s.; strictly net. =Contents.= 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. Part III., =Practical X Ray Work=--Chapters I., Installations.--II., Radioscopy.--III., Radiography.--IV., X Rays in Dentistry.--V., X Rays in Chemistry.--VI., X Rays in War.--Index. =List of Plates.= _Frontispiece_--Congenital Dislocation of Hip-Joint.--I., Needle in Finger.--II., Needle in Foot.--III., Revolver Bullet in Calf and Leg.--IV., A Method of Localisation.--V., Stellate Fracture of Patella showing shadow of "Strapping".--VI., Sarcoma.--VII., Six-weeks'-old Injury to Elbow showing new Growth of Bone.--VIII., Old Fracture of Tibia and Fibula badly set.--IX., Heart Shadow.--X., Fractured Femur showing Grain of Splint.--XI., Barrell's Method of Localisation. * * * * * =DRYING BY MEANS OF AIR AND STEAM.= Explanations, Formulae, and Tables for Use in Practice. Translated from the German of E. HAUSBRAND. Two Diagrams and Thirteen Tables. Demy 8vo. 1901. 72 pp. Price 5s.; India and Colonies, 5s. 6d.; Other Countries, 6s.; strictly net. =Contents.= Preface.--British and Metric Systems Compared--Centigrade and Fahr. Thermometers.--Chapters I, Introduction.--II., Estimation of the Maximum Weight of Saturated Aqueous Vapour which can be contained in 1 kilo. of Air at Different Pressure and Temperatures.--III., Calculation of the Necessary Weight and Volume of Air, and of the Least Expenditure of Heat, per Drying Apparatus with Heated Air, at the Atmospheric Pressure: _A_, With the Assumption that the Air is _Completely Saturated_ with Vapour both before Entry and after Exit from the Apparatus.--_B_, When the Atmospheric Air is Completely Saturated _before entry_, but at its _exit_ is _only_ 3/4, 1/2 or 1/4 Saturated.--_C_, When the Atmospheric Air is _not_ Saturated with Moisture before Entering the Drying Apparatus.--IV., Drying Apparatus, in which, in the Drying Chamber, a Pressure is Artificially Created, Higher or Lower than that of the Atmosphere.--V., Drying by Means of Superheated Steam, without Air.--VI., Heating Surface, Velocity of the Air Current, Dimensions of the Drying Room, Surface of the Drying Material, Losses of Heat.--Index. * * * * * =Leather Trades.=