Thanks Aghadowey.
Thanks Brown ... that sounds like another book I should get my hands on. I don't think I've seen that photo (there are a couple of him floating about).
The Rev. W. D. Killen was still at Belfast Inst. at the time his sister married Samuel O. McCausland. He seemed to do quite well there, winning 'premiums' in several different subjects. Here's a newspaper notice about his call to Raphoe:
Belfast Newsletter, 14 Aug 1829
Rev. W. D. KILLEN. --- We have great pleasure in stating, that on Monday last, the Rev. W. D. Killen, of Ballymena, was called to the Presbyterian congregation of Raphoe, by the unanimous votes of its members. There was not on the occasion a single dissenting voice -- the call was given with the utmost cordiality and harmony, a circumstance which cannot but be gratifying to the distinguished young gentleman, who has thus been invited to the ministerial charge of that respectable congregation. -- Mr. Killen is well known in Belfast, especially at the Institution, where he gained an eminence in the more profound as well as in the lighter departments of science, that has been equalled by but a few. If learning, talents, soundness of religious principle, and excellence of moral character, be recommendations, we can from personal knowledge congratulate the congregation of Raphoe on their choice of Mr. Killen.
I don't suppose the book mentions the Rev. Joseph Osborne of Corboy (1792-9), Scriggan (1799-1802), and Newtownards (1802-27)? I'd really like to figure out who his father was. If it was William Osborne he was probably a 1st cousin once/twice removed from Samuel McCausland - if he was the son of Samuel C. Osborne, then he may have been Samuel McCausland's uncle.