Note 3 — Chapter IV · IN MID-ORINOQUIA

In a work written on the Orinoco in 1822, Mr. J. H. Robertson, referring to this matter, declares that “the biting, blistering, and intolerable itching” which is produced by clouds of mosquitoes is “indeed enough to make a man mad.” He says that they made the passengers—blacks as well as others, that were on the boat with him, “almost roar with agony,” and that in the morning the “whole body exhibited one mass of small blisters from millions of bites we had received during the night.”3