No more than a handful of churches were to be built in France during the first half of the eighteenth century with freestanding columns and lintels, but the subject of the letters was taken up (unacknowledged) by Antoine Desgodetz, professor at the Académie d’Architecture from 1719 until his death in 1728. Like Cordemoy, he discussed the orders at length, but over the years he expanded his lectures to include a range of building types. His lectures on church design seem to have been introduced in 1723. He dealt in detail with early Christian basilicas. The models of the churches that he proposed were all based on them, with freestanding columns along their naves, but carrying arches, not lintels. The radical nature of Cordemoy’s proposals became evident only in 1753, when they were taken up (duly acknowledged) by Marc-Antoine Laugier in yet another small book, the "Essai sur l’architecture", and infused in the conceit of the primitive hut – four tree trunks supporting four horizontal beams, with a pitched roof over – providing an image (illustrated only in the edition of 1755) of all the essential elements of architecture and thus the reference for all architectural judgment. Any other features were to be regarded as superfluous and thus redundant. This was the model for a rational architecture. And it was taken up, albeit elaborated, in 1757, as the model for the most ambitious church of the century, Jacques-Germain Soufflot’s Sainte-Geneviève (now known as the Panthéon) in Paris. Perrault, Cordemoy, Laugier and Soufflot all considered that the arrangement they upheld was a proper expression of that of both the Greek temple and the Gothic church. This notion of structural expression was to condition much of the theory and the architecture of the following centuries.