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X Rays. 



PRACTICAL X RAY WORK, By Frank T. Addyman, 

 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. Twelve Plates from Photographs of X Ray 

 Work. Fifty-two Illustrations. 200 pp. Price IDs. 6d. ; India and 

 Colonies, lis.; Other Countries, 12s.; strictly net. 



Contents. 



Historical— Work leading up to the Uiscovery of the X Rays — The Discovery— Appara- 

 tus and its Management— Electrical Terms— Sources of Electricity— Induction Coils- 

 Electrostatic Machines— Tubes— Air Pumps— Tube Holders and Stereoscopic Apparatus — 

 Fluorescent Screens- Practical X Ray Worlc— Installations— Radioscopy— Radiography— 

 X Rays in Dentistry— X Rays in Chemistry— X Rays in War— Index. 



. . List Of Plates. 



Fronitspiece — Congenital Dislocation of Hip-Joint. — 1., 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.— XL, Bar- 

 ren's Method of Localisation. 



India-Rubber and Gutta Percha. 



INDIA-RUBBER AND GUTTA PERCHA. Translated 

 from the French of T. Seeligmann, G. Lamy Torvilhon and H. 

 Falconnet by John Geddes McIntosh. Royal 8vo. 



[Out of print. Second Edition in preparation. 

 Contents. 



India-Rubbei' — Botanical Origin — Climatology — Soil — Rational Culture and Acclimation 

 of the Different Spe:ies of India-Rubber Plants — Methods of Obtaining the Latex — Methods 

 of Preparing Raw or Crude India-Rubber — Classification of the Commercial Species of 

 Raw Rubber — Physical and Chemical Properties of the Latex and of India-Rubber — 

 Mechanical Transformation of Natural Caoutchouc into Washed or Normal Caoutchouc 

 (Purification) and Normal Rubber into Masticated Rubber — Softening, Cutting, Washing, 

 Drying—Preliminary Observations — Vulcanisation of Normal Rubber — Chemical and Physical 

 Properties of Vulcanised Rubber — General Considerations — Hardened Rubber or Ebonite — 

 Considerations on Mineralisation and other Mixtures — Coloration and Dyeing — Analysis 

 of Natural or Normal Rubber and Vulcanised Rubber — Rubber Substitutes — Imitation Rubber, 



Gutta Percha — Botanical Origin — Climatology — Soil — Rational Culture — Methods of 

 Collection — Classification of the Different Species of Commercial Gutta Percha — Physical 

 and Chemical Properties — Mechanical Transformation — Methods of Analysing — Gutta Percha 

 Substitutes — Index. 



Leather Trades. 



PRACTICAL TREATISE ON THE LEATHER IN- 

 DUSTRY. By A. M. Villon. Translated by Frank T. 

 Addyman, B.Sc. (Lond.), F.I.C., F.C.S. ; and Corrected by an Emi- 

 nent Member of the Trade. 500 pp., royal 8vo. 123 Illustrations. 

 Price 21s. ; India and Colonies, 22s. ; Other Countries, 23s. 6d. ; strictly 

 net. 



Contents. 



Preface — Translator's Preface — List of Illustrations. 



Part I., Materials used in Tanning — Skins; Skin and its Structure; Skins used in 

 Tanning; Various Skins and their Uses — Tannin and Tanning Substances; Tannin; Barks 

 (Oak) ; Barks other than Oak ; Tanning Woods ; Tannin-bearing Leaves ; Excrescences ; 

 Tan-bearing Fruits; Tan-bearing Roots and Bulbs; Tanning Juices; Tanning Substances 

 used in Various Countries; Tannin Extracts; Estimation of Tannin and Tannin Principles. 



Part II., Tanning: — The Installation of a Tannery; Tan Furnaces; Chimneys, Boilers, 

 -etc.; Steam Engines — Grinding and Trituration of Tanning Substances: Cutting up Bark; 

 Grinding Bark ; The Grinding of Tan Woods ; Powdering Fruit, Galls and Grains ; Notes on 



