In reply to tehmarks:
A very interesting read, thanks.
Think that's the first photo I've seen of the Lower Einich bothy (it was just after you cross the Beanaidh Bheag) and certainly the first of the Dubh Ghleann howff.
It was almost exactly half a century later (June '82) that I did a 5 day sweep of the Cairngorm Munros myself, but an unimproved Hutchy Hut is all I can claim of historical interest.