Is the capitalized "Female Sex" for emphasis or meaning with the same with the word "great"?

I suppose "Female Sex" is being used as a title. I don't believe it correct to capitalize something for emphasis.

Roger is right, except it does not appear to refer to a title.

Therefore I would say it should not be capitalised here. It is an error.

In adddition, Lilly is a female name. How can we call her " Mr. Lilly ?" Another error?

Lilly is likely a surname in this case.

James Lilly would be Mr. Lilly

Thank you very much. This sentence is from an old chap book, and at first, I thought the author used these errors deliberately. That may not be the case~

Aha. In that case, it is worth mentioning that about 150 years ago or longer, it was standard practice to capitalise far more words than we do today.
If you look at a book like The Pilgrim's Progress, the text looks quite different.