Part,  Chapter

1 1,7|   coals, where those shistose pyrites abound which are met with
2 1,7| manipulations. These shistose pyrites being composed principally
3 1,7|       some pieces of shistose pyrites, buttressed one against
4 1,7|  covered with a thin layer of pyrites, previously reduced to the
5 1,7|    Then new layers of bruised pyrites were arranged so as to form
6 1,7|       best. ~When the heap of pyrites had been entirely reduced
7 2,9|      sea-weeds supplied soda, pyrites supplied sulphuric acid,