Hardback book (no dust jacket) titled MANNERS FOR THE An Entrance Key to the Fantastic Life of the 400 by Francis W. Crowninshield. Published by Appleton in 1912. See my photographs (4) of this book on main listing page. Bookseller since 1995 (LL-13-bottom-R) rareviewbooks
PROPOSALS by women, while permissible, are not customary, and, although they are yearly becoming more and more popular, are still regarded as an innovation. If the proposal is rejected, good taste and kindly consideration demand that the gentleman should keep it more or less of a secret.
It is, of course, not always easy for a gentleman to know when he has been definitely proposed to. Women's ways are sometimes devious and obscure. Roughly speaking, it is a proposal, or its equivalent, when a lady throws her head upon his breast and bursts into a passionate flood of tears.
Welp, as someone who writes romance, that felt a little on the nose!
I was searching for 1910s glove etiquette when this came up. It has very little on that topic (though it does mention "glove powder," which put me on a rabbit hole to https://clickamericana.com/topics/bea..., so I guess that's something).
The book is humor/satire, so I can only assume that most of the (usually ridiculous) text ranges from exaggeration to outright lies. It's very short, so if you're into the 1910s it might be worth a read. That said, I think the funniest joke is the one I quoted.