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Although completely foiled in his search after the law of refraction, which was subsequently discovered by Willebrord Snell, and sometime afterwards by James Gregory, he was, singularly successful in his inquiries respecting vision.
Martin's rising to a daring height above one of the most magnificent Gothic cathedrals in the Netherlands; this seat of the Anglo-Saxon Willebrord, who eight hundred years before had preached Christianity to the Frisians, and had founded that long line of hard-fighting, indomitable bishops, obstinately contesting for centuries the possession of the swamps and pastures about them with counts, kings, and emperors, was still worthy of its history and its position.
Martin's rising to a daring height above one of the most magnificent Gothic cathedrals in the Netherlands; this seat of the Anglo-Saxon Willebrord, who eight hundred years before had preached Christianity to the Frisians, and had founded that long line of hard-fighting, indomitable bishops, obstinately contesting for centuries the possession of the swamps and pastures about them with counts, kings, and emperors, was still worthy of its history and its position.
Martin's rising to a daring height above one of the most magnificent Gothic cathedrals in the Netherlands; this seat of the Anglo-Saxon Willebrord, who eight hundred years before had preached Christianity to the Frisians, and had founded that long line of hard-fighting, indomitable bishops, obstinately contesting for centuries the possession of the swamps and pastures about them with counts, kings, and emperors, was still worthy of its history and its position.
He had done this with the astronomical measurements of Tycho Brahe, and had extracted from them the celebrated 'laws of Kepler. He did it also with Vitellio's measurements of refraction. But in this case he was not successful. The principle, though a simple one, escaped him, and it was first discovered by Willebrord Snell, about the year 1621.
For in the time of Pepin, King of the Franks, and his son Charles the Great, and when 700 years more or less had elapsed since the birth of the Lord, Willebrord with eleven others did irrigate the said land with the waters of their holy preaching.
As for the first and chief of these spiritual rivulets, namely that great man and true saint, Willebrord, we know the tale of how he appeared here by sure testimony.
It remained for Willebrord Snell, a Dutchman, about the year 1621, to discover the law in question, and for Descartes, a little later, to formulate it. Descartes, indeed, has sometimes been supposed to be the discoverer of the law. There is reason to believe that he based his generalizations on the experiment of Snell, though he did not openly acknowledge his indebtedness.
Martin's rising to a daring height above one of the most magnificent Gothic cathedrals in the Netherlands; this seat of the Anglo-Saxon Willebrord, who eight hundred years before had preached Christianity to the Frisians, and had founded that long line of hard-fighting, indomitable bishops, obstinately contesting for centuries the possession of the swamps and pastures about them with counts, kings, and emperors, was still worthy of its history and its position.
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