miss barr , on the other hand , seems unaware that there exists any alternative to following her natural inclinations in this respect ; and i am very sure , that if someone were so obliging as to introduce turtle-shells as acceptable garb for gentle-bred females , miss barr would don one with pleasure , and instantly retract all her appendages within , whenever she was menaced by any extraordinary danger , such as the possibility that she might be addressed civilly by some person previously unknown to her .