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Perhaps there is no single book on diagnostic methods which has had as wide influence as this treatise of Professor Sahli, and when we come to look for the reason, it is undoubtedly to be found in the fact that the treatise is not a mere description of methods of clinical examination, compiled from text-books and journal articles, but really a critical survey of the clinical procedures, almost all of which have been used and carefully tested in the clinic at Bern. It therefore represents actually the work of one man, and the stamp of his authority gives the book a value which it could attain in no other way. In many instances, moreover, the paragraphs on the use and value of certain instruments and methods of examination have appeared first in this book and, in a way, therefore, the treatise must be considered as an original communication. The