A Brief Diversion

[drelmo]

Is which's (?whiches) a word, like whose?

Consider:

The mixed group of dogs rushed about, vocalizing in a most distressed manner. Which's bark, or howl or moan, was the most disturbing?

Or, if you think that even generic dogs are human enough to require who, then:

The scientists had set up a display with half a dozen species of cockroaches. You

Comments

[arch_scrivener]

Just use which. Yes, it's imprecise. It's not the only gap in the language, and far from the most annoying. Second-person singular vs. plural pronouns, for example.

[jeffr23]

By analog with "its", the apostrophe seems deeply incorrect to me, even considering that "which is" doesn't contract.

[entheos]

I would use the "which one's" construct in both cases.