microscopically

from WordNet (r) 3.0 (2006)

microscopically
    adv 1: by using a microscope; so as to be visible only with a
           microscope; as seen with a microscope; "the blood was
           examined microscopically"; "the seeds were
           microscopically small"
    2: as if by using a microscope; with extreme precision and
       attention to detail; in minute detail; "every manuscript was
       edited microscopically"

from The Collaborative International Dictionary of English v.0.48

Microscopically \Mi`cro*scop"ic*al*ly\, adv.
   By the microscope; with minute inspection; in a microscopic
   manner.
   [1913 Webster]