Hitherto, ever since the discovery of magnifying-glasses, there had been here and there a man, such as Leuwenhoek or Malpighi, gifted with exceptional vision, and perhaps unusually happy in his conjectures, who made important contributions to the knowledge of the minute structure of organic tissues; but now of a sudden it became possible for the veriest tyro to confirm or refute the laborious observations of these pioneers, while the skilled observer could step easily beyond the barriers of vision that hitherto were quite impassable.    From Wordnik.com.  [A History of Science: in Five Volumes. Volume IV: Modern Development of the Chemical and Biological Sciences] Reference

Leuwenhoek, his countryman and contemporary, made notable discoveries with regard to capillary circulation and the blood corpuscles of man and animals.    From Wordnik.com.  [Representative Men] Reference

Hartsocher and Leuwenhoek disputed with each other the honour of having first seen the vermiculi of which mankind are formed.    From Wordnik.com.  [Letter XVII-On Infinites in Geometry, and Sir Isaac Newton’s Chronology] Reference

If, from the mastodon and the fossil mammoth, to which Buffon attributes five or six times the bulk and size of the elephant, we descend to those animalculae, of which Leuwenhoek estimates that a thousand millions of them would not occupy the place of an ordinary grain of sand. ".    From Wordnik.com.  [Willis the Pilot] Reference

Though Leuwenhoek, Swammerdam.    From Wordnik.com.  [The Human Comedy: Introductions and Appendix] Reference

Leuwenhoek, Winslow, Eustachius, Heister, Vesalius.    From Wordnik.com.  [Representative Men] Reference