This wonderful resource for the nobility of Scotland (nine volume set) is available online. There is an index in volume 9.
The Scots Peerage, Sir James Balfour Paul, Ed., 1904 Vol 1
http://archive.org/stream/scotspeeragefoun01pauluoft#page/n7/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1905 Vol2
http://www.archive.org/stream/scotspeeragefoun02paul#page/n5/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1906 Vol3
http://www.archive.org/stream/scotspeeragefoun03paul#page/n7/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1907 Vol4
https://archive.org/stream/scotspeeragefou00paulgoog#page/n4/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1908 Vol5
https://archive.org/stream/scotspeeragefoun05paul#page/n5/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1909 Vol6
http://www.archive.org/stream/scotspeeragefoun06paul#page/n5/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1910 Vol7
http://www.archive.org/stream/scotspeeragefoun07paul#page/n5/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1911 Vol8
http://www.archive.org/stream/scotspeeragefoun08paul#page/n7/mode/2up
The Scots Peerage, Sir James Balfour Paul, Ed., 1914 Vol9
http://www.archive.org/stream/scotspeeragefoun09paul#page/n7/mode/2up