> Certainly, I hope anyone commenting on this will take note of the publishing date being more than 100 years ago.

That's irrelevant when discussing the mechanism, genesis and development of a system that goes back millienia.

> they'll say something like, "he's from the janitor class, but thats okay, because he's a doctor"

What are you basing this on? Exogamy between castes remains very low, even between different high castes.