13 JULY 1907, Page 26

Messrs. Kelly and Sons send us a very convenient wooden

rule on which the sizes of books (with cut edges) are marked, the length being given on one side, the width on the other. These sizes are in number twenty-two, ranging from the 48mo (31 in. x 2 in.) to the royal folio (20 in. x 127 in.) Of octavo sizes there are seven, of quarto sir, of folio five. These measure- ments apply to modern books; old volumes will not be found always to coincide.