Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 The Royal Society is collaborating with JSTOR to digitize, preserve, and extend access to Philosophical Transactions of the Royal Society of London. ® www.jstor.org Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010 Downloaded from rstl.royalsocietypublishing.org on January 4, 2010