Rickcd
Looks like you and I have the same challenge, too many Howies in Ayrshire.
The James Howie I’m looking for is listed in Pigot’s directory for 1824/25 but not in 1837, so I’m assuming he either died or moved between these dates. When I read your piece about Acharacle I thought I may have found him. Unfortunately it’s a different Dr. James Howie. The 1868 County Directory lists a Dr. James Howie living at Ardshealach Lodge so I checked the 1861 census and, sure enough, he is there. Problem is that this Dr. James Howie is only aged 31. He was born in Loudon, Ayrshire though so there might be a connection.
The only Thomas Howie I’ve come across was registered in Stevenston in 1810, the son of Robert Howie but that’s all I know about him. I was looking at Robert possibly being a brother of my Dr. Howie but I never got anywhere.
Sorry I can’t help. Looks like we’ll just have to keep searching.