Accordingly, from the beginning he invented the smith's art, and husbandry to manure the ground, that it might yield him corn; he invented arms and the art of war to defend corn; physic and astronomy, with other parts of mathematics which might be useful to keep corn a great number of years in safety from the injuries of the air, beasts, robbers, and purloiners; he invented water, wind, and handmills, and a thousand other engines to grind corn and to turn it into meal;leaven to make the dough ferment, and the use of salt to give it a savour; for he knew that nothing bred more diseases than heavy, unleavened, unsavoury bread.