London. Royal Astronomical Society, 1907. [2], 577, plus 'List of Additions,' paged 35-68, plus viii Index. Illustrated with 8 full-page plates and with diagrams etc., within the text. Bound in half calf over marbled boards, recently rebacked. Octavo. Ex-libris Ministry of Defence with their stamp to the title-page and occasionally throughout; ‘withdrawn’ stamp to front endpaper; corners a little worn; else a very good copy.