Arcana naturae, ope & beneficio exquisitissimorum microscopiorum detecta, variisque experimentis demonstrata : una cum discursu & ulteriori dilucidatione, epistolis suis ad celeberrimum, quod Ser.mi Magnae Brittanniae regis auspicio Londini floret, philosophorum collegium datis, comprehensa (1696)
Leeuwenhoek, Antoni van, 1632-1723 · Lugduni Batavorum : Apud Cornelium Boutestein · leaf 182
Microscopy -- Early works to 1800 · Natural history -- Pre-Linnean works · Physiology -- Early works to 1800
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.