The most valuable features of this work are the exceptionally fine and delicate histologic illustrations engraved on steel and printed on thick paper to eliminate show-through. Each image is faced with detailed explanatory captions. Of the images the author writes in the preface (p. vi):

"The one hundred and thirty-seven illustrations are all original, and were made by Mr. Hermann Faber and Mr. Erwin F. Faber. It would be impossible to exaggerate the faithfulness and skill with which they have performed their work. All but one of the drawings are by Mr. Erwin F. Faber, and the etchings on steel are partly by one and partly by the other of the artists. The sections of tissues are, with two exceptions, my own preparations. The drawings were made with the camera lucida, the outlines, dimensions and relations of parts being thus kept true to nature. With each picture is a scale, magnified to the same extent as the tissues, which enables anyone to ascertain the enlargement. The method, as concerns the etchings, has probably been seldom if ever previously employed. The reflection of the magnified object was thrown by the camera lucida upon the steel plate and traced directly with the needle by the etcher, thus obviating the necessity for the intermediate sketch which is ordinarily used in etching. For accuracy this method cannot be surpassed."

Digital facsimile from Google Books at this link. (Unfortunately, the scan published was done artlessly, and fails to provide high quality reproductions of the very delicate etchings.)