1. The true measure of a sire's merit is the high average production of all his daughters and the excellent type of all his offspring, rather than the total number of Advanced Register daughters, or an exceptional individual. 2. The greatest foundation sire of the Guernsey breed is Presto 14 PS. 3. The two greatest foundation cows of the Guernsey breed are May Rose II 3251 PS and Itchen Daisy 3d. 15630. 4. The two greatest sires or the Guernsey breed, based on the production of their daughters, are Ne Plus Ultra 15265 and King of the May 9001. 5. The two greatest sires of the Guernsey breed, based on the showyard winnings of their offspring, are Hayes Cherub 2d 25147 and Ladysmith's Cherub 30760. 6. The four greatest sires or the Guernsey breed, based on both production and individual merit of offspring are King of the May 9001, Ne Plus Ultra 15265, Hayes Cherub II 25147, and Lord Mar 14359. 7. The two greatest dams of the Guernsey breed, based on the show yard winnings of their offspring, are Ladysmith or the Isle 28355, and Hayes Golden Cherry 3d. 44965. 8. The greatest sires of the Guernsey breed are the result of a cross between closely related families of linebred stock. 9. A study of the pedigrees of great sires, or the Guernsey breed, strengthens the conclusion reached in summary point 8. / Master of Science