La explicación es bastante sencilla,…   Comienza este párrafo así y yo tiemblo. ¿Cómo puede tomarse esto en serio?     742.   The explanation is to a large extent simple, on the theory of the selection of successive slight modifications, each being profitable in some way to the modified form, but often affecting by correlation other parts of the organisation. In changes of this nature, there will be little or no tendency to alter the original pattern, or to…