Meanwhile I flatter myself with so much success, that: students... will not be so easily mistaken in the subjects of the mineral kingdom, as has happened with me and others in following former systems; and I also hope to obtain some protectors against those who are so possessed with the figuromania, and so addicted to the surface of things, that they are shocked at the boldness of calling a marble a limestone, and of placing the Porphyry amongst the Saxa.

Sand in reality is nothing else than very small stones.