[texhax] Wilson's Title PM Won't Compile

[Alessandro Ceschini]

Hello everybody, I cannot get to compile Wilson's Title PM, I get the 
following error:

! Undefined control sequence.
\titlePM ->\begingroup \drop
                              = 0.1\txtheight \vspace *{\baselineskip } 
\vfil...
l.36 \titlePM

?

Minimal working example:

     \documentclass{minimal}

     \newcommand*{\titlePM}{\begingroup% Gentle Madness with Printers' 
Ornaments
     \drop = 0.1\txtheight
     \vspace*{\baselineskip}
     \vfill
       \hbox{%
       \hspace*{0.1\txtwidth}%
       {\wb{18pt}{18pt}
        \begin{picture}(0,0)
          \multiput(0,0)(0,20){22}{\textcolor{Medium}{Q}}
        \end{picture}
       }
     %  \rule{1pt}{\txtheight}
       \hspace*{0.15\txtwidth}%
     \parbox[b]{0.75\txtwidth}{
       \vbox{%
         \vspace{\drop}
         {\noindent\HUGE\bfseries Some\\[0.5\baselineskip] 
Conundrums}\\[2\baselineskip]
         {\Large\itshape Puzzles for the Mind}\\[4\baselineskip]
         {\Large THE AUTHOR}\par
         \vspace{0.5\txtheight}
         {\noindent The Publisher}\\[\baselineskip]
         }% end of vbox
     }% end of parbox
       }% end of hbox
     \vfill
     \null
     \endgroup}

     \begin{document}
     \titlePM
     \end{document}
-- 
/Alessandro Ceschini/