pride that softens and brightens the face of the Virgin in the cartoon
is one of Leonardo's miracles; beside it the smile of Mona Lisa is
earthly and cynical. Nevertheless, though this is among the greatest
of Renaissance drawings, it is unsuccessful; there is something
ungainly, and in poor taste, in seating the Virgin unstably across the
widespread legs of her mother. Leonardo apparently neglected to
transform this sketch into a picture for the Servites; they had to
turn back to Lippi, and then to Perugino, for their altarpiece. But
soon afterward, perhaps from a variant of the Burlington cartoon,
Leonardo painted The Virgin, St. Anne, and the Infant Jesus of the
Louvre. This is a technical triumph, from Anne's diademed head to
Mary's feet- scandalously naked but divinely fair. The triangular
composition that had failed in the cartoon here came to full
success: the four heads of Anne, Mary, the Child, and the lamb make
one rich line; the Child and His grandmother are intent on Mary, and
the incomparable draperies of the women fill out the divergent
space. The characteristic sfumato of Leonardo's brush has softened
all outlines, as shadows soften them in life. The Leonardesque
smile, on Mary in the cartoon but on Anne in the painting, set a
fashion that would continue in Leonardo's followers for half a
century.
From the mystic ecstasy of these tender evocations Leonardo
passed, by an almost incredible transition, to serve Caesar Borgia
as military engineer (June, 1502). Borgia was beginning his third
campaign in the Romagna; he wanted a man who could make
topographical maps, build and equip fortresses, bridge or divert
streams, and invent weapons of offense and defense. Perhaps he had
heard of the ideas that Leonardo had expressed or drawn for new
engines of war. There was, for example, his sketch for an armored
car or tank, whose wheels were to be moved by soldiers within its
walls. "These cars," Leonardo had written, "take the place of
elephants... one may tilt with them; one may hold bellows in them to
terrify the horses of the enemy; one may put carabineers in them to
break up every company." `050713 Or, said Leonardo, you can put
terrible scythes on the flanks of a chariot, and a still more lethal
revolving scythe on a forward projecting shaft; these would mow down
men like a field of grain. `050714 Or you can make the wheels of the