On the history of the book in general see Max Jordan, Das Malerbuch des Leonardo da Vinci (Leipzig, 1873).
(Milan, 1810); C. Fumagalli, Scuola di Leonardo da Vinci (181 I); Gaye, Carteggio d'artisti (1839-1841); G.
Et la Sala dell' Asse (1902); Id., " 11 Cenacolo di Leonardo," in Raccolta Vinciana (Milan, 1908), the official account of the successful work of repair carried out by Signor Cavenaghi in the preceding years; Woldemar von Seidlitz, Leonardo da Vinci, der Wendepunkt der Renaissance (2 vols., 1909), a comprehensive and careful work by an accomplished and veteran critic, inclined to give perhaps an excessive share in the reputed works of Leonardo to a single pupil, Ambrogio Preda.
It seems needless to give references to the voluminous discussion in newspapers and periodicals concerning the authenticity of a wax bust of Flora acquired in 1909 for the Berlin Museum and unfortunately ascribed to Leonardo da Vinci, its real author having been proved by external and internal evidence to be the Englishman Richard Cockle Lucas, and its date 1846.
Two Evhologia appeared during the second half of the 17th century, one by the bishop Dositheiu (Jassy, 1679-80), which remained almost unknown, and the other based upon the Slavonic, by loan of Vinci (Belgrad, 1689).