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
Arcana naturae is a 1696 Latin natural history treatise by microscopist Antoni van Leeuwenhoek, printed in Leiden for the learned society of London's Royal Society. Its pictures are plain engraved copperplates of microscopic and anatomical specimens, labelled with letters and figure numbers, showing rounded and lobed forms in fine hatched shading that a designer could use for scientific diagram motifs, lettered plates, or early modern specimen layouts.
