Heaven at last! or, the convolutions of Scottish family history

A three-volume edition of The book of the farm : detailing the labours of the farmer, farm-steward, ploughman, shepherd, hedger, cattle-man, field-worker and dairy maid, by Henry Stephens. Sounds fascinating as a glimpse of The Way Things Were, and was apparently the 'bible' of the BBC TV series Victorian Farm - but I'm not sure Somervillians will have made much practical use of it! Stamped on the cover of each volume is a Scottish clan badge, the central device being a crescent, and the motto on the surrounding strap and buckle being 'Denique coelum' - At the last, heaven. Simple to type the motto into Google and find out it belongs to the Clan Melville - but their device is a hound's head, not a crescent. Maybe some side-branch of the clan? Google Images found me the following, on the University of Toronto's register of British Armorial Bindings:

which is exactly what I've got, and comes with the information that it was used by the families of Melville of Murdocairnie in Fife 1672, and of Melville of Strathkinness also in Fife 1773. So how does it come to be on a book published in 1844? A bit more ferreting around, and I discover that the Strathkinness estate, which by then had been joined with the Bennochy estates of the Whyte family,  was inherited in 1883 by John Balfour of Pilrig, who assumed the name and arms of Melville of Strathkinness.

So how did the books come to Somerville? Written on the bookplates is the information that they were given by Mrs Stotherd, but there is no Stotherd listed in the College Register, so she must have been a well-wisher rather than an old member. But there is one Stotherd in the Oxford Dictionary of National Biography, who ended up as director-general of the Ordnance Survey, and who in 1875 married as his second wife one Elizabeth Janet Melville. Serious genealogists may like to pursue this further; I think I'd better get back to my books!