of spring, because, when the heat is almost temperate and the moisture has made its appearance and the air is clear, the fruit will not require much heat during the process of assimilation. Consequently maturity comes quickly and takes place before the days of spring. Bitterness or harsh ness of flavour is prevalent in all trees when they are first planted. The reason is that when the moisture is in their extremities and has caused assimilation in the parts that are in the middle of the tree, from which the material of the fruit comes, the dryness comes forth and follows the moisture, and the first assimilation will be sour or bitter or harsh. The reason is that the assimilation takes place in the heat and moisture, and when moisture or dryness prevails over the heat, the fruit so produced will not at first have under gone complete assimilation, and consequently the production of fruit is at first without sweetness.
Bennut-trees[1] at first when the fruit appears are sweet, and subsequently become harsh in flavour and finally bitter. The reason of this is that the tree has excessive rarity in it, and at the time of assimilation, when the ducts are wide, the heat will follow the moisture and will cause the fruit to mature; consequently the fruit will be sweet at first. Subsequently the heat attracts the dryness which resembles its own nature, and will cause the ducts to contract, and cold and dryness will prevail over heat and moisture; the fruit, therefore, will change to a harsh flavour. Next, the 830asun with its heat will prevail through the attraction of superfluous[2] moisture in the seed, which is present at the first appearance of the tree, and the cold will prevail over the dryness; the fruit will therefore become exceedingly harsh in flavour. Next, the natural heat will rise upwards, and the heat of the sun outside will assist it; therefore the heat and dryness will prevail, and the fruit will become bitter.
Here ends the book on Plants.
