De harenae copiis cum habeatur explicatum, tum etiam de calce diligentia est adhibenda,uti de albo saxo aut silice coquatur; et quae erit ex spisso et duriore, erit utilis in structura, quae autem ex fistuloso, in tectoriis.
After furnishing an account of the supply of sand, we must next be careful about lime, to burn it out of white stone or lava; the lime which shall be out of thick and harder stone will be useful in the main structure; that which shall be of porous material, in plaster work.
final_alignments\Vitruvius_Architecture_Book_2.json