  Even the clearest and most perfect	
  circumstantial evidence is likely to be	
  at fault, after all, and therefore	
  ought to be received with great	
  caution. Take the case of any pencil,	
  sharpened by any woman; if you have	
  witnesses, you will find she did it	
  with a knife; but if you take simply	
  the aspect of the pencil, you will say	
  that she did it with her teeth.	
