Blake's use of the vertical, [155]
Blocking in the drawing, [90]
Blocking out with square lines, [85], [120]
"Blue Boy," Gainsborough's, [223]
Botany, the study of, [36]
Botticelli's work, [34], [51], [145], [163]
Boucher's heads compared with Watteau's, [211]
Boundaries of forms, [93]
Boundaries of masses in Nature, [195]