123 pages with diagrams and indexes. Duodecimo (6 1/4" x 5") bound in original publisher's red cloth with gilt lettering to spine and front cover. A C White's Christmas series number 17 with Christmas greetings tipped in. (Betts: 35-3) First edition. 100 examples of blocks by various composers, classified in 4 main sections: Block (sub-divided by king key, queen key, etc. Changed-mate blocks (sub-divided by type of key). Added-mate blocks (sub-divided by type of key). Block-threats (sub-divided by type of key). There is a 10 page introduction by White, solutions and an index of composers. Condition: Pencil notation to front end paper with some occasional marginalia, spine ends bumped, spine dulled else a very good copy.