This set me to study how to order my fire, so as to make it burn some pots. I had no notion of a kiln, such as the potters burn in, or of glazing them with lead, though I had some lead to do it with; but I placed three large pipkins and two or three pots in a pile, one upon another, and placed my firewood all round it, with a great heap of embers under them. I plied the fire with fresh fuel round the outside and upon the top, till I saw the pots in the inside red-hot quite through, and observed that they did not crack at all. When I saw them clear red, I let them stand in that heat about five or six hours, till I found one of them, though it did not crack, did melt or run; for the sand which was mixed with the clay melted by the violence of the heat, and would have run into glass if I had gone on; so I slacked my fire gradually till the pots began to abate of the red colour; and watching them all night, that I might not let the fire abate too fast, in the morning I had three very good (I will not say handsome) pipkins, and two other earthen pots, as hard burnt as could be desired, and one of them perfectly glazed with the running of the sand.