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George Simon, one of England's outstanding radiologists, has rewritten and updated his admirable text, Principles of Chest X-ray Diagnosis, adding 114 illustrations and 24 charts and diagrams to the third edition— the first appeared in 1956. The new revision continues a pattern of didactic clarity found in Simon's other contributions, and is characterized by excellent illustrations, lucid and concise language, a logical arrangement of material under headings descriptive of the X-ray shadows, and forthright, sensible opinions about the worth of different diagnostic methods.
The appendix, entitled "Some Hints on X-ray Techniques," has many pearls. Some relate to the use of ordinary equipment, astonishing in these days of complex, expensive equipment that is difficult to maintain and quickly obsolescent. For example, Simon compares chest films made with the new high and the old low kilovoltage techniques. Cardiac borders are sharper with the new, he says; the appearance of vascular shadows is