When a book has passed to its seventh edition the most that can be done by the examiner is to record the fact, and to note the changes that have taken place since the preceding edition. The author says, "The present edition like the last has been carefully arranged by my son, Dr. John K. Mitchell. Some changes were made in the sixth edition and a few more have been made now as a result of added years of experience. Some points of treatment have been more fully dealt with. The Chapter on Massage has been wholly rewritten, in order to describe the process according to the methods which on use and observation appear to be the best, and to notice the last physiologic studies and its effects."
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A 1898 study studied this question.