Apparently Isaac Coles had an interest in botany, as evidenced by this 1880s entry in an unidentified journal. His vocation as a surveyor would have made such observations very convenient.
From "Glen Cove - Images of America" (by Joan Harrison, 2008); Thomas Hewlett Coles (1851-1896) was the eldest of the five children of Thomas Coles and Mary G Willets. Of Quaker upbringing, he married the Quaker daughter of Philadelphia doctor Seth Pancoast and (the late) Sarah Saunders Osborne on 9-Oct-1888. Thomas and Sallie had one child, Mary Gertrude (1894-1982), who married Stanley Justus Donaldson at Dr. Pancoast's Ardmore, PA home on 9-Feb-1921. From longislandgenealogy.com. 'Deaths Reported by the Long Islander, 1891-1900': "COLES Thomas Hewlett, 44 years; d. 9 August 1896 after a long illness; son of Isaac Coles; husband of Sallie Pancoast; son-in-law of the late Dr. Seth Pancoast of Philadelphia, Pa.; father of Gertrude Coles; A well known in Philadelphia and New York as well as on Long Island; member of the Society of Friends; Glen Cove item". This dispels a notion I had about my grandmother's name. I thought she took to "Gertrude" only once she was an adult, but it's clear here that's what she was being called when just two years old.
Post card from "THC" (Thomas Hewlett Coles; 1851-1895) to Miss Sallie Emma Pancoast (1856-1937) ~~~~~~~~ [New York, 25 September 1888] "I have found R.L. Walker's house address. 53 Cambridge Pl, Bklyn. So that settles that. And I don't know whether I gave their Mr. Peters' [?] as 53 South St N.Y. or not. I believe that is all, if not let me know. Look on other (?) list for cards." I think this communication is for sorting out issues with the invitations for their marriage at Sallie's parents' home on 9 October 1888.