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impetus of the principal current,  and the  other
       depends on the incident  and reflected  motions"
       (Windsor  12579).  Tne  artificial design,  in  effect,
       takes its cue from  the natural pattern,  elaborating
       the inherent  behavior of the physical world.  The
       parallels go beyond water and hair,  extending  to
       such phenomena  as deluges,  plant growth, and
       configurations  of drapery.         M.K.









       173  t

       Leonardo da Vinci
       Florentine, 1452-1519
       PRINCIPAL  ORGANS   AND  VASCULAR AND
       URINOGENITAL    SYSTEMS  OF A WOMAN

       c.  1507—1508
       pen  and brown ink  and wash over  black chalk  on
       washed paper,  main outlines pricked for  transfer
       47.8.X  33.3  (l8 /4Xl}V8)
                   3
       inscribed with  notes on anatomical and
       physiological  matters
       references:  Popham  194.6, 247; Clark  and  Pedretti
       1968-1969, 12281; Keele and Pedretti 1979-1980,
       i22r; London 1989, 52
       Her  Majesty  Queen Elizabeth n, Royal  Library,
       Windsor  Castle


       This extraordinarily  large and complex demon-
       stration  (Windsor  12281)  represents  the  climax of
       Leonardo's attempt,  in a phase of his anatomical
       studies in 1507-1508, to create  composite  demon-
       strations  of what  may be called the  "irrigation" of
       the human  body, synthesized from his  dissections
       and readings.  The left  side of the  sheet was drawn
       first,  and the  major outlines  were pricked for
       transfer.  The sheet was then  folded  vertically
       along the center line,  and the design was dupli-
       cated on the  right half.  Further pricking was
       undertaken, presumably for the transfer of the
       whole scheme to another  sheet.  On the  verso
       some of the  outlines have been traced in a grace-
       less and inaccurate manner,  probably  by  another
       hand.  Leonardo reminds himself in a note  to
       "make this demonstration  also viewed  from  the
       side, so that  knowledge may  be given of how
       much one part is behind  another,  and then  make  to resolve the  problem of definition.  In spite of  by Mundinus  (Mondino de' Luzzi), probably in
       a demonstration  from behind/' We may doubt  these problems, however, the  final  effect  exudes a  the version printed in Johannes Ketham's  Fascicu-
       whether  the  desired clarity could ever have been  remarkable sense of heroic grandeur and provides  lus medidnae  (1494), but  Leonardo is not  afraid  to
       achieved, because he endeavors to make such  vivid testimony  to the awe with which Leonardo  challenge his predecessor's ideas:  "You, Mondino,
       drawings carry more information than  is really  regarded the  complex machinery of the  human  say that  the  spermatic vesicles or testicles  [the
       possible, using  a bewildering  variety of  diagram-  body.                           ovaries in women]  do not cast out true semen,  but
       matic conventions.  Some forms are shown in  Several traditional  notions, gleaned from  his  only a certain salivary humor, which nature has
       three dimensions,  others in schematic  outline,  reading of anatomical texts, are apparent  in this  ordained  for the  delectation  of women  in coitus,  in
       some in transparency, and a few in cross section.  drawing, including the two-chambered heart and  which case it would not be necessary that  the  ori-
       Even the  parallel hatching,  designed to provide a  the spherical uterus, with  its inner  "cells" and  gins of the  spermatic vesicles should  arise in  the
       background for the  organs, can ultimately  do little  tendinous  "horns." His chief  source is a textbook  same way in women as in men."  In contrast to

       274  CIRCA  1492
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