Obs. [SUB- 24.] Subtle or unobserved entrance.
1653. H. More, Antid. Ath., II. ii. § (1712), 45. This forcible endeavour of the subingression of the air is not from the pressure of the ambient Air.
1660. Boyle, New Exp. Phys. Mech., iii. 44. The pressure of the ambient Air is strengthened upon the accession of the Air suck’d out; which, to make it self room, forces the neighboring Air to a violent-subingression of its parts. Ibid. (1674), Obs. Saltn. Sea, 8. That in the drawing op of the Vessel through the Salt water … the taste may have been alter’d by the subingression of Salt water.
