Chapter VIII

. ('Origin') on Hybridism, a subject treated in the Sketch with 'Variation under Nature' in the first part.

The following list of the chapters of the second part of the Sketch will illustrate their correspondence with the final chapters of the 'Origin.'

## Chapter I . "On the kind of intermediateness necessary, and the number

of such intermediate forms." This includes a geological discussion, and corresponds to parts of Chapters VI. and IX. of the 'Origin.'

## Chapter II . "The gradual appearance and disappearance of organic

beings." Corresponds to Chapter X . of the 'Origin.'

## Chapter III . "Geographical Distribution." Corresponds to Chapters XI.

and XII. of the 'Origin.'

## Chapter IV . "Affinities and Classification of Organic beings."

## Chapter V . "Unity of Type," Morphology, Embryology.

## Chapter VI . Rudimentary Organs.

These three chapters correspond to Chapter XII . of the 'Origin.'

##