 | 1871 - 590 pàgines
...nur das Studium der Verschiedenheiten im Besonderen zu einem befriedigenden Abschluss führen. ***) The prevention of free crossing and the intentional matching of individual animals are the oorner stones of the breeder's art. 1 1 Bei dem wilden Pferd« soll der Hengst sich nie mit seiner... | |
 | 1871 - 606 pàgines
...nur das Studium der Verschiedenheiten ¡m Besonderen zu einem befriedigenden Abschluss führen. ***) The prevention of free crossing and the intentional matching of individual animals are *« corner stones of the breeder's art. t Bei dem wilden Pferde soll der Hengst sich uie mit seiner... | |
 | Charles Darwin - 1876 - 544 pàgines
...variety, when they live mingled together and are not exposed to any cause inducing excessive variability. The prevention of free crossing, and the intentional...matching of individual animals, are the corner-stones of tho breeder's art. No man in Ids senses would expect to improve or modify a breed in any particular... | |
 | Carl Semper - 1881 - 506 pàgines
...prevention of free crossing and the intentional matching of individual animals are the corner-stone of the breeder's art. No man in his senses would expect to improve or modify a breed in a particular manner or keep an old breed true and distinct unless he separated his animals. The killing... | |
 | Charles Darwin - 1887 - 528 pàgines
...variety, when they live mingled together and are not exposed to any cause inducing excessive variability. The prevention of free crossing, and the intentional...true and distinct, unless he separated his animals. The killing of inferior animals in each generation comes to the same thing as their separation. In... | |
 | Conwy Lloyd Morgan - 1891 - 542 pàgines
...little or no intercrossing between * Its importance in artificial selection was emphasized by Darwin: " The prevention of free crossing, and the intentional...animals, are the corner-stones of the breeder's art " ("Animals and Plants under Domestication," ii. 62). the slow-moving molluscs in adjoining valleys... | |
 | Staff - 1891 - 542 pàgines
...Shorthorn Intelligence in BeWs Messenger. In this remarkable production, Mr. Darwin says at once that the prevention of free crossing and the intentional...of individual animals are the corner-stones of the breeders' art : but he adds that, with the evidence before him, he is convinced that it is a great... | |
 | Charles Darwin - 1896 - 734 pàgines
...variety, when they live mingled together and are not exposed to any cause inducing excessive variability. The prevention of free crossing, and the intentional...true and distinct, unless he separated his animals. The killing of inferior animals in each generation comes to the same thing as their separation. In... | |
 | American Philosophical Society - 1896 - 554 pàgines
...other. t Darwin ( Variation under Domestic., ii, p. 62) says : " The prevention of free crossing, «nd the intentional matching of individual animals, are the cornerstones of the breeder's art," and "Xo man in his senses would expect to improve or modify a breed . . . unkss be separated his animals."... | |
 | Johannes Paulus Lotsy, Marius Jacob Sirks, Havik Nicolaas Kooiman - 1921 - 604 pàgines
...variety, when they live mingled together and are not exposed to any cause inducing excessive variability. The prevention of free crossing, and the intentional...his senses would expect to improve or modify a breed injany particular manner, or keep an old breed true and distinct, unless he separated his animals.... | |
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It is free intercrossing which chiefly gives uniformity, both under nature and under domestication, to the individuals of the same species or variety, when they live mingled together and are not exposed to any cause inducing excessive variability. The... 
