Sub Articulo 122.0

 For a book I am writing I defined a new environment, called "example."  It
 is not a theorem-like environment, but an ordinary environment.  Anyway,
 I'm having trouble referencing it.  I defined a counter to go with it, so
 I assumed that if I gave a label to the environment, as in
 
 \begin{example}\label{ex:1}
 ...
 \end{example}
 
 and then later used \ref{ex:1}, that this would work.  It doesn't.  It
 compiles fine, but the example numbers on the the references are all
 wrong.