"We have learned some new things about leaves today, Norah," said Fred, "and I want to try and tell you all about it. But before I begin you might think of some of the things we told you about leaves the other evening.""Well," said Norah, "I know that all leaves have veins running through them. In some leaves the veins run side by side, but in most of the leaves the veins spread about in a sort of network. The veins all come from the ribs, which stretch across the blade, and the ribs spring from the footstalk of the leaf.""That"s very good," said Fred. "Now listen, while I tell you the most wonderful thing of all about the leaves.
"Teacher says that the surface of the leaf blade is crowded with tiny holes or pores.""I suppose," said Norah, "our eyes are not sharp enough to find them, for I cannot see them.""No," said Fred, "we children can"t see them, butthey are there, Norah. They are breathing pores. The leaves breathe in air through these pores.""You know what the root-hairs do?"