# Change font size inside the document [duplicate]

Possible Duplicate:
How to change font size mid document?

This is my code:

\documentclass[12pt,a4paper]{book}
\renewcommand{\baselinestretch}{1.5}
\begin{document}
\include{Chapter1}
\end{document}


I would change the font size from 12 to 10 in a page inside the document and not the entire document. How can I do it please?