Yes, it is. I had a bare memory of the story from when I was a kid, then was happy to find it in a really good one-volume SF collection of classics that came out a few years back; I'll have to dig it out for the name, it had a lot of fine old stories and some really good newer ones. And there was The Monster. I've read it a few times since, enjoyable example of the old "super science" stuff from that era.