I'm going to go against the grain on this one. In a business/professional job setting, unlike residency/fellowship it's really not unreasonable or unusual not to talk terms until both parties decide there's a mutual interest. I'd say sometime in the second interview they will bring it up, but I don't think it's all that unusual that it wasn't mentioned in the first interview, nor would I email about it. Hinting at wanting a Ballpark figure before the second interview will smack of the wrong attitude. Most people with prior careers outside of medicine will tell you we have all gone on many interviews where the terms, once revealed just wouldn't work. But you have to play the game. Most places won't be that interested in the guy who is only interested in talking to them if they are paying over X. Some places don't even decide what X is until they flesh out your experiences and abilities and if they like you what it would take to get you (salaries are not all lockstep -- Gawande had a good article ("Timepieces"?) on negotiating surgical salaries a few years back).