Morgan Stanley Profit Falls, Shares Drop  NEW YORK (Reuters) - U.S. investment bank Morgan Stanley  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MWD.N target=/stocks/quickinfo/fullquote"&gt;MWD.N&lt;/A&gt; on Wednesday said quarterly profit dropped by a third  on lower bond trading revenue and higher expenses, falling  short of Wall Street's low expectations and pushing its shares  down as much as 8 percent.