对巴拉橡胶树(Hevea brasiliansis)的果实、种子、胚和幼苗的生长作了测量。通常,可以这样说,种子发展速率,是在果实的大小已经到达极点之後最快,而胚的发展速率,则在种子的大小已经到达极点之後最快。幼苗的生长习性是有周期性的,周期性的迅速伸长,和周期性的绝对停滞交替进行。大多的生长系在夜间进行。这可以这样的推测就是,虽然顶端组织中水分含量增加对於这个时期内较大的茎伸长作用是一个很重要的因子,但却并不是这种周期性的生长习性的唯一的因子。 The growth of fruits, seeds, embryos and seedlings of Hevea brasilianis was measured. Generally speaking, it can be said that the rate of seed development is fastest after the size of the fruit has reached the pole, and the rate of development of the embryo is fastest after the size of the seed has reached the pole. Seedling growth habit is periodic, rapid rapidity of the cycle, and the cycle of absolute stagnation alternately. Most of the growth at night. This is presumed to be because while the increase in moisture content in the apical tissue is a very important factor for the greater stem elongation during this period, it is not the only factor in this cyclical growth habit.