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their original position in the anther-cells. They then quickly depress themselves till they lie parallel to the bristle; and if the bristle, slightly diverging; and when the bristle, being held in the same relative position, is inserted into the nectary of another flower, the two ends of the pollinia accurately strike the two stigmatic surfaces lying close on each side of the mouth of the nectary. I am, however, not quite sure that I understand the by what the whole mechanism causing the pollinia to divergence for I find that moths often remove one pollinium alone; and this fact leads me to suspect that they insert their probosces obliquely into the nectary.)

from one side of the flower.) (The flowers smell very sweetly and the abundant nectar

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touched struck. The two strap-shaped discs lie close together, and form the roof of the mouth of the nectary. They are not enclosed, as in Orchis, by a lower lip or pouch, so that the structure of the rostellum is simpler.— When we come to treat of the homologies of the rostellum we shall see that this difference is due to a small change, namely, to the lower and exterior cells of the rostellum resolving themselves into viscid matter; whereas in Orchis the interior cells  alone have thus become developed.)

As the two viscid discs form the roof of the mouth of the nectary, and are thus brought down near the labellum,