Hi Mary I have in my family files a Margaret Dewar b.1839 who married a James Brownlie Dick born 1835. They were married in Carluke Lanarkshire 1858. Margarets Parents were George Dewar and Mary Gold. This Margaret is my 1st cousin 3 times removed. Are you sure she came from Perth ? because this Dewar line is in Lanarkshire. Seems too close a match to be a coincidence.