See here :

http://forums.nitroexpress.com/showflat.php?Cat=0&Number=302597&an=0&page=0#Post302597

(Didn't want to put this up in every sub-forum, as a newbie ... but since you ask ...)

This will be an exceptional book, with loads of previously unknown details, as least in part from material I have in my possession, as Alexander Henry's great great grandson.