[metapost] How to change label font

[Steven Woody]

In the manual, i got 'defaultfont' used to change font.  but i found
it took no effects.  i guess this may caused by that i am using latex,
that is i used following statements at beginning of a mp source:

verbatimtex
%&latex
\documentclass{article}
\begin{document}
etex

in this case, how can i change font?  thanks.

-- 
woody

then sun rose thinly from the sea and the old man could see the other
boats, low on the water and well in toward the shore, spread out
across the current.