duction to the subject of crystallography.
The second and third volumes, which are only nom nearing completion, were to give a more detailed treatment of specific subjects in the theor) and techniques of X-ray analysis, and in the interpretation of these analyses from the standpoint of crystal physics and chemistry.
This volume contains a quite complete but not unduly detailed survey of the subject of crystallography.
The survey includes a discussion, with examples, of the experimental methods used in crystal analysis; the general fundamentals of diffraction from crystal lattices: the elements of the geometry of crystal symmetry systems, crystal classes, and space groups; the physical chemistry of crystals; and the physics of X-ray and electron diffraction.
An historical survey is included, but is reserved for a late chapter.
In the appendices are given more detailed information about the production and properties of X-rays, and tables of emission spectra and absorption edges, absorption coefficients, atomic scattering factors, and space group nomenclature.
A short bibliography of reference books, which has been brought up to date, is included.
The survey nature of the book should make it a valuable text and general reference for the worker in other fields who wishes to be familiar with the methods and language of crystallography.
:\ very clear descriptive style and copious use of simple diagrams greatly increase its value as a reference text.
The material included in the physical chemistry section is now out of date, but still serves to illustrate the methods used in and the types of information available through X-ray studies.
A. D.