John Trapp on Isaiah 19:7

Ver. 7. The paper-reeds by the brooks] i. e. By the ſtreams of Nilus: for where this River arriveth not, is nothing but a whitiſh ſand bearing no graſs, but two little weeds called Suhit and Gazul, which burnt to aſhes maketh the fineſt Chryſtal-glaſſes.

And every thing ſown by the brooks] As far as Nilus ouer-floweth, is a black mould, ſo fruitful as they do but throw in the ſeed, and have four rich Harveſts in leſs then four moneths.