organize his own selling system, his advertising had to be largely by private correspondence with scholars and book-sellers throughout Europe laboriously composed with his own hand; yet it was imperative that the business become as soon as possible self-supporting, or at least that losses in one quarter should be recouped by profits in another. It was in his edition of Virgil, 1501, that Aldus first employed the new cursive or sloping letter which later came to be known in English printing as italic type. According to tradition he copied it closely from the handwriting of the Italian poet Petrarch. The type was very compact, covering many more words on a page than the roman of that day, and was used as a body type, not as in our day for isolated words and phrases set apart for emphasis or other distinction from the rest of the text. Aldus also, though not the first to cast Greek type, gave his Greek fonts an elegance which was soon imitated, like the italic, by other printers. By the introduction of small types which were at the same time legible, and by adopting for his classical texts a small format suitable for pocket-size books, Aldus invented the modern small book. No longer was it necessary for a scholar to rest a heavy folio on a table in order to read; he might carry with him on a journey half a dozen of these beautiful little books in no more space than a single volume of the older printers. Furthermore, his prices were low. The pocket editions or small octavos sold for about two lire, or forty cents in the money of that day, the purchasing power of which in modern money is estimated at not above two dollars.