Anyone who wishes to see the g-host of a flower has only to make & very simple experiment. Let him go up to a cluster of blossoms and look verv intently for several minutes at oneside oí it. Then very suddenly he must turn his gaze upon the other side of the same cluster. He will at once distinctly see a faint and delicate circle of colored lig-ht around this second half of the cluster. The lig-ht is always in the hue which is "complementary" to that of the flower. The specter of ihe scarlet poppy is of a greenish white. The g-host of the primrose is purple. The g-host of the blue fring-ed Ifcntian is of a palé gold tint. In these circles of color the shapes of the flower's petals are always faintly but clearly seen.