Hi Gill, it is hard to say for sure, but early editions of this book seem to be from 1895, and later printings, e.g.(http://library.nma.gov.au/libero/WebOpac.cls?VERSION=2&ACTION=DISPLAY&RSN=100060430&DATA=DNM&TOKEN=2VsvY7cSiP9990&Z=1) from1913, so it could be anywhere in this period really.