Note 4 — BILLY AND HANS

This idea that a squirrel’s teeth grow too long from not gnawing hard food is, I think, a mistake, as Billy’s never grew beyond their proper form, nor did Hans’s. Billy used to sharpen his teeth by grinding them together. I have often heard the process going on as he lay by my ear on my pillow at night. The cases known of long teeth requiring cutting off were probably due to the breaking of the opposing tooth.