Acknowledgments

Acknowledgment of all sources of information and assistance in the evolution of this book from its first edition in 1964 to this, the seventh edition, is impossible. However, I would like to thank specifically the following colleagues and friends for their many and varied contributions.

Dr. Y.Z. Abdelbaki, Dr. T.H. Belling, Jr., Miss Elsie Bergland, Dr. R.W. Davis, Dr. G.P. Epling, Dr. R.A. Kainer, and Dr. H. Meyer.

The many publishers who loaned illustrations and tables.

Dr. Charles W. Miller for the section in the fourth edition on the use of ultrasound.

Dr. Sandra Pitcaithley for assistance with microscopic images for this and the previous (sixth) edition.

Dr. Anna Fails and Dr. Lee Wilke for rewriting the fifth edition as coauthors of the sixth and seventh editions, and Dr. Fails for her original artwork for the sixth and seventh editions.