If a man made himself an expert in any particular branch of human activity, there would result the strong tendency that a peculiar aptitude towards the same branch would be found among some of his descendants.
![If a man made himself an expert in any particular branch of If a man made himself an expert in any particular branch of Image](https://www.idlehearts.com/images/if-a-man-made-himself-an-expert-in-any-particular-branch-of.jpg?x85372)
If a man made himself an expert in any particular branch of human activity, there would result the strong tendency that a peculiar aptitude towards the same branch would be found among some of his descendants.