Published Arcana Naturae Microscopiorum (Nature's Mcroscopical Mysteries), 19 Letters from 28 - 52 (2nd)

January 1, 1696

In 1696, Leeuwenhoek re-titled the volume Anatomia Seu Interiora Rerum and re-published as a second edition (editio altera) it under the title Arcana naturae, ope & beneficio exquisitissimorum microscopiorum, detecta.

It was sometimes bundled with Continuatio Epistolarum, Letters 52-60.

Dobell confused this title with the similarly titled Arcana naturae detecta.