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PREFACE BY THE TRANSLATOR

could only have been attained by the physico-mathematical method of investigation which he employed. The value of his results can only be properly estimated by the anatomist and physiologist; but his practical application of certain of them in the work which you have rendered so successfully in English, cannot fail to be fully appreciated by the general reader"

In conclusion, I have to thank Professor Meyer for his courteous consent to my undertaking this translation, and for the additions with which he was kind enough to favour me. I have also to express my obligations to his publishers, Messrs. Meyer and Zeller of Zürich, for allowing me to have the woodcuts used in the original

Stratford-on-Avon, July 1860.