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Great is the number of ten-sous pieces spent in the four-sous stalls! The professor saw a pamphlet by Vicq-d'Azyr, a complete Charles Bonnet in the edition of Fauche Borel, and an essay on Malus. "And such then is the sum of our achievements," he said to himself. "Malus! A genius arrested in his course when he had almost captured the empire of light! But we have had Fresnel.
The quality of two-sidedness conferred upon light by bi-refracting crystals may also be conferred upon it by ordinary reflection. Malus made this discovery in 1808, while looking through Iceland spar at the light of the sun reflected from the windows of the Luxembourg palace in Paris.
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