petent meafure, unlefle theyfirft learn the Do£trine of Plain and Spherical Trian-gles ,• and there being but fmall encouragement hi-therto given, to thofe that have , and doe (till beftowtheir pains in this, for the publick good, we are notto wonder, if the mod of our Sea-men, be not fo… … EPISTLE DEDICATOR!. a* am almoft perfwaded , that the cloud of Ignorance*which is fpreadasa fogge upon the Ocean \ fhallfud-denlybedifpelled; in confidence whereof, I have ta-ken upon me the boldnefle, to prefent this enfuingTreatife to your Honour , and humbly begge that itandmyfelfemay…
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![An illustration from De insulis inuentis : Epistola Cristoferi Colom (cui [a]etas nostra multu[m] debet: de insulis in mari Indico nup[er] inue[n]tis. Ad quas perquirendas octauo antea mense: auspicijs et [a]ere inuictissimi Fernandi Hispaniarum Regis missus fuerat) ad magnificum d[omi]n[u]m Raphaelez Sanxis ... missa.](https://img.insideoutlibrary.com/img/200/ia-deinsulisinuenti00colu_0-14-0.webp)
