...dependent upon its more or less perfect Adaptation to the Conditions of Existence. It seems evident that what takes place among the individuals of a species...least capable of counteracting the vicissitudes of food-supply, &c., must diminish in numbers, and, in extreme cases, become altogether extinct. Between...

...among the individuals of a species must also occur among the several allied species of a group,—viz., that those which are best adapted to obtain a regular...least capable of counteracting the vicissitudes of food-supply, &c., must dimmish in numbers, and, in extreme cases, become altogether extinct. Between...

...dependent upon its more or less perfect Adaptation to the Conditions of Existence It seems evident that what takes place among the individuals of a species...those species which, from some defect of power or organisation, are the least capable of counteracting the vicissitudes of food-supply, etc., must diminish...

...among the individuals of a species must also occur among the several allied species of a group,—viz., that those which are best adapted to obtain a regular...those species which, from some defect of power or organisation, are the least capable of counteracting the vicissitudes of food-supply, etc., must diminish...

...in health and vigor-pthose who are best able to obtain food regularly, and avoid their niflrierous enemies. It is, as we commenced by remarking, 'a struggle...of counteracting the vicissitudes of food supply, etc., must diminish in numbers, and, in extreme cases, become altogether extinct. Between these extremes...

...therefore, that each year an immense number of birds must perish — as many in fact as are born. . . . It is, as we commenced by remarking, ' a struggle...and, in extreme cases, become altogether extinct." " Most or perhaps all the variations from the typical form of a species must have some definite effect,...

...perfectly organized must always succumb. " Now it is clear that what takes place among the individual of a species must also occur among the several allied...and, in extreme cases, become altogether extinct." " Most or perhaps all the variations from the typical form of a species must have some definite effect,...

...diseased, — while those that prolong their existence can only be the most perfect in health and vigor — those who are best able to obtain food regularly,...of counteracting the vicissitudes of food supply, etc., must diminish in numbers, and, in extreme cases, become altogether extinct. Between these extremes...

...Dependent Upon Its More or Less Perfect Adaptation to the Conditions of Existence It seems evident that what takes place among the individuals of a species...of counteracting the vicissitudes of food, supply, 8cc., must diminish in numbers, and, in extreme cases, become altogether extinct. Between these extremes...

...scarce, can never attain a large population. This is probably the reason why woodpeckers are scarce with us, while in the tropics they are among the most abundant...of counteracting the vicissitudes of food supply, etc., must diminish in numbers, and, in extreme cases, become altogether extinct. Between these extremes...