"More charms displayed in form and feature."
Page 209: 'break', possibly (Oxford English Dictionary), break^{3} -
n. Carriage-frame with no body, for breaking in young horses; large
wagonette. Seems correct in context:
"Seems that break went wrong going down-hill. Well, no "safety
tandem" for _me_ again--can't _stand 'em_, myself, not being in
favour of infanticide. Give _me_ a good old mail cart!"
[^ represents a superscript.]