...L'église de Saint-Sernin de Toulouse, est un des monuments de nos provinces méridionales qui donne la plus complète et la plus vive empreinte de ces influences romano-grecques et des principes de proportions qui avaient été appliqués à la structure romaine par les Grecs du Bas-Empire. En effet, le système de proportions admis à Saint-Sernin procède du dedans au dehors.

Ce système de proportions est dérivé des triangles équilatéraux et isocèles rectangles. Nous donnons d'abord la moitié de la coupe transversale de l'édifice (fig. 2)...

This image comes from Dictionary of French Architecture from 11th to 16th Century (1856) by Eugène Viollet-le-Duc (1814-1879).

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