Which preposition to use with microscopic

in Occurrences 3%

The ultimate elements of which the body is composed consist of "masses of living matter," microscopic in size, of a material commonly called protoplasm.

of Occurrences 1%

And, meanwhile, on that white page, the "Pilgrim" drawn on an exact scale, would be smaller than the most microscopic of infusoria!

Which preposition to use with  microscopic