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Excerpt from OEuvres Complètes de Christiaan Huygens, Vol. 13: Dioptrique, 1653, 1666, 1685-1692; Fascicule I, 1653, 1666
Ajoutons que, quelques jours feulement après qu'il ent donné 'a Tacquet la defcription de fon traité projeté et partiellement achevé Huygens entreprit de nouvelles recherches relatives cette fois a lathéorie de l'arc-em-ciel, et fe pr0pofai1dc les inférer dans ce traité Il ne l'a pas fait; mais elles nous ont été confervées et nous les reproduifons comme Appendice II, au,, Liber I mentionné ci-defl'us.
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