FOREWORD (by Bernhard Berenson)
To my ideal history of art all sorts of servants would bring tribute, all sorts of workmen would be summoned to help.

PREFACE
Possum ergo sane redargui qui ad talia vacco scilicent scribendo puerilia seu interutilia.... --Anonynus Bernensis, saec. XI
 
Where do you suppose he got those colours? I think he evolved them out of his Inner Consciousness. -- Dear Old Lady to a young copyist in the National Gallery, A.D. 1922
 
This volume is designed for those who care for what my dearest enemy calls, "the cookery of art," for those who wonder about the natures and the sources of the materials out of which painters in the Middle Ages compounded objects that we still cherish.