[net.sf-lovers] Does someone know the name of this story?

labelle@hplabsc.UUCP (WB6YZZ) (10/11/83)

         I once read (at least ten years ago) a SF short story about a lab
assistant who was treated in someway by a scientist in the lab. He began
shrinking on a table top until he fell through the cracks in the wood.
He kept shrinking through what appeared to be endless universes, landing
on planets shrinking more etc- forever.

         My wife wants to read this one but I don't remember the author or
title. I think I read it in one of those omnibus's of SF.

         Anyone out there remember this one?

                        TNX GEORGE