The first indicates the progress of crafts and industries necessary for Egypt from beginning to end. The second, the trade of the inhabitants of Europe, Asia, and Africa, like the caravans of the Levant, War Furoster, the Hijaz, and the meeting of different prices, measures, and weights. according to the different countries used in them. The third mentions matters of agriculture, as it was a cause of prosperity for the people of Egypt in past ages, so it should be the first thing the state pays attention to in the blessed kingdom of Egypt, with its fertile soil and agriculture, which has many important branches. Among these is the science of saving expenses, from which branches out the improvement of farms and meadows, the cultivation of cotton, indigo, beans, and olives, and the cultivation of mulberries, the extraction of indigo flour, and the extraction of many types of oils, and knowledge of beekeeping, silkworms, and weaving worms, and the care of domestic animals and the improvement of local animals, such as camels, goats, and livestock. wool, and the import of foreign animals, and knowledge of veterinary medicine and treatment of their diseases. such as the stomach of sheep, and the preservation of grains from weevils, and the planting and raising of trees along the roadsides, and the care of gardens and all other agricultural buildings suitable for the benefit of agriculture. In the matter of agriculture, we mention dates and the canals that extend to irrigate the lands. and the canals, as well as the roads, bridges, and dams in the plains and mountains that extend to deliver water. All of these are mentioned in agriculture. The fourth, we talk about matters of natural science, the science of the three kingdoms, and mathematical sciences. There we talk about magnetic material used by doctors in treating paralysis and the like, as well as electrical power, spherical heat, and celestial phenomena. and the dew and the passages that occur between the tropics. We also talk about the stones of lightning and the mountains of fire called volcanoes, and natural machines like volcanoes.