Cramer's 'Mad Money' Follow-Up: Sept. 15

Every night on "Mad Money," Jim Cramer offers market commentary and general investment advice, and he makes calls on specific stocks, both of his own choosing and in response to viewer requests. He relies on his many years of experience and strong track record, and he takes full responsibility for his calls.

"I never shirk from admitting my mistakes; instead, I dwell on them to learn from them. I change my mind, I take losses, I own up to them," Cramer has said.

Here we track some of his calls from the previous episode of "Mad Money" and find out, at least in the very short term, how the stocks are performing. Keep in mind that Cramer might not have been recommending that viewers take immediate action on a stock. And, of course, it's up to the individual investor to do his or her own homework.

That said, here's how some of the stocks that Cramer talked about on Monday's "Mad Money" show fared today.

---

Boeing(BA Quote): "We're a lot better off now than we were a year ago," said Cramer. He said we're on our way to a full-blown economic recovery, maybe even in the aerospace industry, if Boeing's Dreamliner flies by the end of the year.

On Tuesday, Boeing closed up $1.10, or 2.2%, at $52.07.

Airgas(ARG Quote): Cramer spoke with Airgas Chairman and CEO Peter McCausland, who said that infrastructure products are coming back on line. He said Airgas boasts a diverse clientele and can always "find new places to grow" its business. Cramer called McCausland a "bankable CEO" and said he supported Airgas.

On Tuesday, Airgas added $1.18, or 2.6%, to $47.43.

U.S. Natural Gas(UNG Quote): Cramer put U.S. Natural Gas in his Sell Block on Sept. 10, warning that it its 11% premium to the price of natural gas would be lost if new regulations went into effect. His prediction came true two days later, and the ETF was up only 2% vs. a 12% spike in natural gas.

On Tuesday, U.S. Natural Gas gained 24 cents, or 2.2%, to $11.09.

To watch replays of Cramer's video segments, visit the Mad Money page on CNBC.