“Mr. Hazard is, no doubt, the best posted supporter of the system in this country, and may be regarded as authority. If his recommendations for the selection of dairy stock are worthless then the whole Guenon system may be condemned as being utterly fallacious. His book deserves careful attention from intelligent farmers.”—_Bucks County Intelligencer._ “In a majority of cases, the marks have been reliable, and this should incite all dairy folks to know what is said about it.”—_Meehan’s Gardner’s Monthly._ “It embraces a sketch of Guenon, and the progress of his discovery; extracts from his preface explaining his views; an explanation of his system of escutcheon marks; descriptions of the various escutcheons and their indications of value and quantity, and directions how to apply them in practice, together with the report of the commission of which the author served as secretary. Nearly one hundred illustrations are given, those of the escutcheons being photographed from the drawings in Guenon’s last revised edition.”—_Country Gentleman and Cultivator._ “Remarkable as was M. Guenon’s method, and although his discoveries were duly made known in this country, this is the first time that his methods have been compiled for practical use. By the use of this little handbook, there can be no doubt, but that farmers and stock raisers would save a vast amount of money. The explanations are simple and easily followed, the numerous illustrations serving to elucidate the text.”—_Boston Evening Traveler._ “Beginning with a little sketch of the method of the birth of the system in Guenon’s mind, the author goes on in a clear and concise manner to explain by plain language and appropriate drawings, the various so called ‘milk mirrors’ and their values, being properly understood, as aids in selecting good dairy stock. The various opinions of those adverse to the ‘theory’ are fairly discussed, and the reports of various agricultural societies which have from time to time investigated it are given, together with the report of the Pennsylvania commission. Taken altogether, Mr. Hazard has succeeded in making a very readable, interesting and valuable book, and one which, whatever may or may not be the preconceived ideas of its reader, cannot fail to interest and instruct him upon a subject which should be far better understood amongst farmers generally, than it at present is.”—_New England Homestead._