I have just received a reply from Mt. Jerome, which confirms the conclusion I reached yesterday.
"The number 897 is a reference for the photo and has no relevance to Mount Jerome. Mary Cooke died 14/03/1924 aged 79, she died at 184 Rathgar Road and was a single lady. I hope this is of some help to you, if not please get back to me."
So "myluck!" you were right on the ball, inc. the Rawsons, thanks again.
I will now concentrate on finding out all I can about John Jones of Kildare, and I believe his Dublin address was Jervais St. (not Jervis).
Again many thanks for all the help I received.
Ken