Date: 1686, 1689, 1697

"As soon as ever the Parts begin to be form'd by Nature, this Animal and active Principle begins to exert its Heat and Force, being lodged in the Heart as in the Centre of the Body, from whence, as the Vessels begin also to be form'd, it distributes it self towards the extreme Regions, communicat...

— Nourse, Timothy (c.1636–1699)

Date: 1704

"Remark your commonest pretender to a light within, how dark, and dirty, and gloomy he is without; as lanterns which, the more light they bear in their bodies, cast out so much the more soot and smoke and fuliginous matter to adhere to the sides."

— Swift, Jonathan (1667-1745)