获得第二个最新版本的源代码

I’m new to Mercurial. I’m trying to clone the second newest commit from the web interface, and everything I’ve red says I need to enter the revision number. However, the web interface only shows “age”, “author”, “description” and at the bottom has “rev 27: (0) tip” I know which one I want based on the description, and it’s the second from the top. How do I get it? I assume when I did I’m new to Mercurial. I’m trying to clone the s