Me thinks it seems very probable, that nature has in these passages, as well as in those of Animal bodies, very many appropriated Instruments and contrivances, whereby to bring her designs and end to pass, which 'tis not improbable, but that some diligent Observer, if help'd with better Microscopes, may in time detect.

Micrographia, Observation, XVIII (p. 116), Printed by Jo. Martyn & Ja. Allestry. 1665