graphs of X Ray Work. Fifty-two Illustrations. 200
pp. Price 10s. 6d. net. (Post free, 10s. 10d. home; 11s. 3d. abroad.)

#Contents.#

#Historical# -- Work leading up to the Discovery of the X Rays -- The
Discovery--#Apparatus 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 Work# -- Installations -- Radioscopy --
Radiography -- X Rays in Dentistry -- X Rays in Chemistry -- 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.

#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-Rubber# -- Botanical Origin -- Climatology -- Soil -- Rational
Culture and Acclimation of the Different Species 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