1734. Those constituting the meninx over the brain are guardian spirits, because that meninx is thoroughly saturated with blood; likewise those who constitute the meninges over the little organs of the brain. But those surrounding the little bundles of fibers and interior nerves [in the body]* are spirits. For as the fibers arise from their own organic beginnings, so do spiritual things from heavenly. Moreover, just as in the fetus every membrane had been bloody and its derivative fibers as if without blood, so the case is with guardian spirits, and so on. 1748, 27 March. * See the index at Nervus.