The influence of Leonardo was strongly felt in Milan, where he spent
so many of the best years of his life and founded a School of
painting. He was a close observer of the gradation and reflex of
light, and was capable of giving to his discoveries a practical and
aesthetic form. His strong personal character and the fascination of
his genius enthralled his followers, who were satisfied to repeat his
types, to perpetuate the "grey-hound eye," and to make use of his
little devices. Among this group of painters may be mentioned
Boltraffio, who perhaps painted the "Presumed Portrait of Lucrezia
Crivelli" (Plate VII.), which is officially attributed in the Louvre
to the great master himself.