...humans, "can we doubt (remembering that many more individuals are born than can possibly survive) that individuals having any advantage, however slight,...others, would have the best chance of surviving and procreating their kind?"8 We will not fall into a crude Social Darwinism if we extend this observation...

...species, or with the individuals of distinct species, or with the physical conditions of life . . . We may feel sure that any variation in the least degree injurious would be rigidly destroyed. This preservation of favorable variation and the rejection of injurious...

...selection and its definition as follows: "If such [useful variations] do occur, can we doubt . . . that individuals having any advantage, however slight,...others, would have the best chance of surviving and of procreating their kind? . . . [The] preservation of favorable variations and the rejection of injurious...

...occur, can we doubt (remembering that many more individuals are born than can possibly survive) that individuals having any advantage, however slight,...others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree...

...occur, can we doubt (remembering that many more individuals are born than can possibly survive) that individuals having any advantage, however slight,...others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree...

...advantage, however slight, over others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree injurious would be rigidly destroyed. This preservation of favorable individual differences and variations, and...