/0/12932/coverbig.jpg?v=435984ca781e3cc3c0b89d7f52ef06f1)
If we compare the flowers of different plants, we shall find almost infinite variety in structure, and this variation at first appears to follow no fixed laws; but as we study the matter more thoroughly, we find that these variations have a deep significance, and almost without exception have to do with the fertilization of the flower.
In the si