Attamus saith: Know, O all ye investigators of this Art, that our work, of which ye have been inquiring, is produced by the generation of the sea, by which and with which, after God, the work is completed! ‘Take, therefore, Halsut and old sea stones, and boil with coals until they become white. Then extinguish in white vinegar. If 24. ounces thereof have been boiled, let the heat be extinguished with a third part of the vinegar, that is, 8 ounces; pound with white vinegar, and cook in the sun and black earth for 42 days. But the second work is performed from the tenth day of the month of September to the tenth day [or grade] of Libra. Do not impose the vinegar a second time in this work, but leave the same to be cooked until all its vinegar be dried up and it becomes a fixed earth, like Egyptian earth. And the fact that one work is congealed more quickly and another more slowly, arises from the diversity of cooking. But if the place where it is cooked be humid and dewy it is congealed more quickly, while if it be dry it is congealed more slowly.