Published Opera Omnia, seu Arcana Naturae Microscopiorum (The Works, or Nature's Microscopical Mysteries), 25 Letters from 28 - 60 (4th)

January 1, 1722

Opera Omnia, seu Arcana Naturae Ope & beneficio exquisitissimorum Microscopiorum Detecta, Edition novissima.

This is volume 1 of the four (sometimes five) volumes of Latin translations. It has the most elaborate title page and contains all but six of the earliest self-published letters 28 through 52.

Four-volume sets often include letters 53 through 60, the Continuatio Epistolarum.