Thank you so much for the link,it has been very useful.
However i searched for Robert Johnston ( also Johnson, he was known by that spelling )and didn't find any results at all, for 1839 Ship Solon.
I did find a Robert Johnston aged 22 on the Ship Erin 21 May 1838.
Would the details of Robert's arrival and which ship he sailed on be accurate ? Because i have a feeling the Robert on the Ship Erin maybe the same person.
Thanks again everyone for the help, it's much appreciated and i really must try and learn to read these documents ! :-)