What to read after Alchemical catechism?

" Take any level table, and set in its centre a vase filled with water; surround the vase with several things of various colours, especially salt, taking care that a proper distance intervenes between them all. Often pour out the water from the vase, and it will flow in streams here and there; one will encounter a substance of a red colour, and will assume a tinge of red; another will pass over the salt, and will contract a saline flavour; for it is certain that water does not modify the places which it traverses, but the diverse characteristics of places change the nature of water. In the same way the seed which is deposited by the four elements at the centre of the earth is subject to a variety of modifications in the places through which it passes, so that every existing substance is produced in the likeness of its channel and when a seed on its arrival at a certain point encounters pure earth and pure water, a pure substance results, but the contrary in an opposite case .