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'At the end of his work Dr. Gadow adds a useful chapter on the geographical distribution of the Vertebrata, with a table showing the approximate number of the known recent species. He also gives a fanciful though striking calculation to show how some groups are still in the ascendant, while others are distinctly declining. The little volume is indeed a welcome addition to the biological student's library, and it deserves the wide circulation which its author's eminence is likely to ensure for it.'—Natural Science.

'It is a book, it need hardly be said, for the student; it is simply a list of the principal sub-divisions of backboned animals, with just as much definition as is needed. It may be regarded as an exceedingly concentrated extract of a full text-book of the vertebrates.'—Daily Chronicle.

'Some years back "Wild Spain," one of the best books of its kind, made you desirous of knowing more of the country. And Hans Gadow has deepened this feeling in his excellent volume "In Northern Spain," and that to an enormous extent. Dwelling at inn or farm, or in their own tent, they saw the country as it has been seen but rarely, and they came to know the inhabitants as they can be known in no other fashion.'—Black and White.

'To persons visiting the provinces with which the author deals, this book will be invaluable, and will do more to point their attention to objects of interest than existing guide-books of Spain, most of which are out of date.'—The Field.

'About the best book of European travel that has appeared these many years.'—Literary World.