If I had space I could quote numerous passages to this effect from highly competent authorities.

Youatt, who was probably better acquainted with the works of agriculturalists than almost any other individual, and who was himself a very good judge of animals, speaks of the principle of selection as "that which enables the agriculturist, not only to modify the character of his flock, but to change it altogether.

It is the magician's wand, by means of which he may summon into life whatever form and mould he pleases.