Alternative series title: Blackie's science readers.
Grey green cloth boards. Design in black (on front cover and spine only): an architectural frame enclosing an outlined cupped shape divided vertically into two symmetrical panels, separated by two enlongated hearts, each panel containing a disc enclosed in a circle, this motif repeated in a smaller size in the lower corners. Spaced dots in upper left corner. Series title and imprint in architectural sans-serif capitals. Spine inscribed with series title and price (1/6) in a frame. Unsigned (LO/C32). From the collection of David Rodger LO/C32. Inscription on fly leaf: "J. Bartle prize for writing Oct, 1903 ..." LO/C32. Stamp on title-page: "With the Publisher's compliments" LO/C32. 219 pages : illustrations, diagrams ; 19cm.