Les Croisements Rationnels dans La Race Pure - Traite Technique d'Elevage, Etude des Principaux Etalons Europeens (Theory of Thoroughbred Matings, Technical Treatise of Breeding, Study of Principal European Stallions) J. Vuillier (Lottery), 2 volumes, 1902 and 1906. cloth and marbled boards, near fine. Vol. II, 221 pgs:French language, with 20 page English translation of the Technical Treatise on Breeding. Vol. I, 235 pgs. With a few b/w photo plates. The meticulous research of Vuillier, which formed the Dosage Theory, used with much success in the breeding and racing studs of the Aga Khans. Scarce volumes in beautiful condition.