I suggest you contact Jane Powner, whom you will find either on this board, or the Isle of Man Family History Society Board. She has researched Boulter, and may have a lead on your Davidson. She also has written an article of Henry Boulter, sons and daughter, for the latest IOMFHS magazine. You would get a copy of this magazine by joining the IOMFHS for a very small charge. Susanne.