970 WILLIAM A. LOCY 
ued to make dissections and anatomical sketches after the death 
of the latter in 1506. We may assume that his method was im- 
proved by intimate collaboration with a professional anatomist, 
but we must recognize that this extraordinary man was a master 
unto himself. The association with Della Torre was not merely 
that of an artist working under an anatomist who exposed the 
parts and required sketches made under his direction. It was 
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Fig. 13 Anatomical sketch by Leonardo da Vinci, 1510 
rather the codperation of two anatomists, one of whom was gifted 
with great powers of artistic delineation. Antonio de Beatis 
had it from Leonardo’s own lips, about 1510, that he had dis- 
sected not less than thirty human bodies, both male and female. 
Leonardo projected a comprehensive work on anatomy of 
which he speaks in his History of Painting, and also in his manu- 
script notes. The notes and drawings bear testimony that this 
treatise was not designed merely for artists but was to be, as well, 
a work for medical students and for the professional anatomist. 
