I'm a scholar researching Caribbean Cookbooks 1850-1950 and have been working on understanding the communities of women who contributed to them. I came across your thread on rootschat as I searched for information on "Mrs. Edgar Watson". The only copy of Sweets Snacks Savouries Unusual Cocktails that I've been able to find is at Schlesinger Library in Cambridge, MA, USA. It was edited by Edith E. Brown and Margaret G Worlledge and was a fundraiser for the Jamaica Branch of the British Sailors Society. All of the women who contributed to the cookbook seem to have been friends and belonged, at least briefly, to a similar circle in the Jamaican elite (the forward to the cookbook was written by Lady Richards, wife of the then-governor of Jamaica). If you happen to come across any further information about that social group, I'd love to hear about it.