Since the first project of 1772, the Chemistry Laboratory was intended to be placed in the location of the old kitchens of the Jesuit complex, however it was an important part of the Reform studies which determined that it needed a completely new building. The Marquês wrote about the construction of the building in February of 1772/3: «Here is the plan for the Chemistry Laboratory that had to be based on a model brought by Dr. José Francisco Leal from the court of Vienna in Austria on my orders, after I learned that this German country had reached the highest level of perfection in this art». This drawing shows the elevation of the southeastern façade of the Chemistry Laboratory that was to be constructed. It is a building in the Neo-Classical tradition of Palladian influence, apart for the dimension of the windows. Relatively simplified in relation to the main façade that runs in a southeasterly direction, the elevation maintains the rhythm of the large windows, surmounted by an arch, marked by pilasters with a group of four outlining the door. It is surmounted by a frieze of Doric inspiration with alternating metopes and triglyphs. The plan and longitudinal section of this building are also held in the Museum.