On the AtoOn the anatomy of vertebratesmy of Vertebrates - fishes and reptiles #265680

In the choice of facts, as then and since acquired by science, I have been guided by their authenticity and their applicability to general principles. In the first, regard has been had to the agreement of several observers, or to the nature of the fact as making it acceptable on the testimony of a single expert. Appearances that require helps to vision are those that call for multiplied concurring testimony, and on such alone are offered the descriptions and illustrations of the microscopical characters of tissues premised to most of the chapters.