Sentence Examples


  • Apex of Ovule, and Pollen-grain.
  • The surface of the pollen-grain is either uniform and homogeneous, or it is marked by folds formed by thinnings of the membrane.
  • Within the pollen-grain is the granular protoplasm with some oily particles, and occasionally starch.
  • The extine is a firm membrane, which defines the figure of the pollen-grain, and gives colour to it.
  • The nucleus of the microspore divides and gives rise to a small cell within the large cell, a second small cell is then produced; this is the structure of the ripe pollen-grain in some conifers (Taxus, &c.).