

PROPERTY FROM THE COLLECTION OF PROFESSOR EGBERT HAVERKAMP-BEGEMANN
It cannot now be ascertained how many sheets the sketchbook of 1650-51 originally contained. Up to 190 sheets remained in the album at the time of the 1937 sale, but others must have been removed prior to that date, and the counting of the sheets seems in any case not to have been precisely undertaken (at the time of the 1918 sale, Campbell Dodgson gave the number of sheets as only 179). In any case, those remaining together in 1937 were separated by Dr. Lilienfeld after he acquired them in 1957.