The Nasdaq and S&P 500 gave bullish signals Tuesday, putting the market on a confirmed uptrend. The Nasdaq climbed 1.2% in higher volume. The gain was sufficiently large to make it a follow-through — a confirmation of a long-attempted rally started on April 15. It’s unusual for a follow-through to hatch so late into a rally, in this case on the 29th day. But that’s no reason to disqualify it.