Morgan Stanley Profit Down, 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, weak equities results and higher  expenses, falling short of Wall Street's low expectations and  pushing its shares down as much as 8 percent.