Slang can become dated very quickly.

wherfore Dr. Rob. urge this on Georg[e] but now when this is sayd, that Xt came in our nature & has Glorified it as an eternal temple to himself[…]the mistery hid from ages & generations, & then revealed Xᵗ in them the hope of glory[…]& Xt taught himself that it was expedient he went, as outwardly, that he might send them that wᶜʰ would be better for them & wᵗ was that, but his own appearance in Spirit.

He turns up the skull between his hands. His fingers explore the calvarium. They emerge through the battered eye sockets.

There are two basic fertile materials: uranium-238 and thorium-232.