Anatomy, study of, its importance, [36], [122]
"Ansidei Madonna," Raphael's, [231]
Apelles and his colours, [31]
Architecture, proportion in, [230]
Art, some definitions of, [18]
Artist, the, [27]
Atmosphere indicated by shading, [102]
Atmospheric colours, [39]
Audley, Lady, Holbein's portrait of, [248]