hi cccarson
having looked through the records on FindMyPast and as you haven,t said wether your james was single or not i,ve put the following in if they don,t appear to be your james let me have more info and i,ll go through the list again only as your probably aware there are over 200 records for johnstons some with first names some with just initials and some without either just surnames here goes
james johnston depart 7 sep 1910 for quebec single man ship corsican official no 124191 .
also on same list david-elizabeth-ellen-martha-sarah -winnie johnston
james johnston 4 may 1911 montreal ship tunisian off no 111248
also mrs johnston
james johnston 16 june 1910 quebec ship corsican off no 124191 single man
james johnston 13 jan 1911 halifax ship hesperion off no 124266 single man
james johnston 6 may 1911 montreal ship laurentic off no 127959 single man occ blacksmith
also mrs e a johnston miss d johnston
james johnston 19 apr 1911 quebec ship corsican off no 40994 single man
as i say if these don,t marry up to your findings if you let me know i,ll dive back in for another look
best wishes
trevor
also r johnston