The Sound of the Trumpet.

original Latin: Clangor Buccinæ. This is a famous title in alchemical literature, signifying a "trumpet blast" to awaken the reader to the secrets of the Great Work.

Extract the quicksilver original Latin: Argentum vivum, or the Philosopher’s Stone, as much from bodies as from the quicksilver itself, because they are of one and the same nature; and you shall have the Mercury and Sulphur from that matter above the earth, from which gold and silver were generated within the earth.

Extract the Quicksilver original German: das Vivum or the Philosopher's Stone original: Lapidem Philos. as well
from the bodies as from the Quicksilver, because they are of one and the same
nature; so you will have the Mercury ☿ and Sulphur 🜍
matter upon the earth, from which Gold ☉ and Silver ☽ are
born in the earth.
The alchemist is explaining that the "Mercury" and "Sulphur" used in the laboratory are the same essential principles that naturally produce precious metals deep underground.