We have three that collect the experiments which are in all books. These we call depredatours.
We have three that collect the experiments of all mechanical arts; and also of liberal sciences; and also of practices which are not brought into arts. These we call mystery men.
We have three that try new experiments, such as themselves think good. These we call pioneers or miners.
We have three that draw the experiments of the former four into titles, and tables, to give the better light, for the drawing of observations and axioms out of them. These we call compilers.
We have three that bend themselves, looking into the experiments of their fellows, and cast about how to draw out of them things of use, and practice for man’s life, and knowledge, as well for works, as for plain demonstration of causes, means of natural divinations, and the easy and clear discovery, of the virtues and parts of bodies. These we call dowry men or benefactors.