Believing that we have thus presented a comprehensive view of this discovery, we trust every one into whose hands this work may come, will patiently, book in hand, go into the farm-yard and judge of the value of his stock by the rules here set forth, compare the results with his individual knowledge of his stock, and fairly estimate the value of the system. The illustrations of the escutcheons are photographed from Guenon’s drawings in his last revised edition. WILLIS P. HAZARD. MAPLE KNOLL, WEST CHESTER, PA., _September, 1879_. LECTURES ON THE GUENON SYSTEM. The author of this work having been invited to lecture a number of times before agricultural societies, and being constantly in receipt of letters of inquiry about repeating his lectures, takes this public opportunity to announce that he will make arrangements to repeat his lecture on the Guenon system, illustrated with a series of large drawings. Correspondence is solicited with officers of agricultural societies, granges, agricultural fairs, colleges, farmers’ clubs, and dairymen’s associations. His principal object being to disseminate widely a knowledge of a system of such great value to his brother farmers, the terms will be satisfactory. At each lecture practical illustrations and instruction is given in the barn-yard or field. Address him at WEST CHESTER, CHESTER COUNTY, PENNSYLVANIA. LECTURE UPON THE CHANNEL ISLANDS, THEIR PEOPLE, AND THE CATTLE. The author having recently spent several months in Guernsey and Jersey for the purpose of studying the habits of the people, viewing the scenery, and acquiring a knowledge of the agriculture, and the breeding of their cattle, has embodied the results of his visits in a lecture, which he is now prepared to deliver before agricultural and other associations. LECTURES UPON AGRICULTURE. The author having been appointed Lecturer upon Agriculture to the Delaware State College, at Newark, Del., will repeat all or part of the course to farmers’ institutes, colleges, schools, &c. The lectures are popular in character, and not too scientific for general comprehension. GUENON’S INTRODUCTION TO HIS NEW REVISED EDITION.