Mr. Gnirrrrü on the Impregnation of Dischidia. 395 
EXPLANATION OF PLATE XVIII. 
Fig. 1. Ovules of Dischidia Rafflesiana, Wall., with a Jae of the placenta, at an early 
stage, magnified. 
Fig. 2. The same, somewhat more advanced. 
Fig. 3. An ovule, taken when the corolla is twice as long as the calyx; the first appearance 
of the subsequent fissure, a, is now visible. 
Fig. 4. The same, taken when the corolla is three times as long as the calyx; a, the more 
developed fissure. 
Fig. 5. The same, taken when the corolla is half-developed ; a, the fissure, is now of consi- 
derable size; 5, the grumous indication of a nucleus. 
Fig. 6. A perfect ovule, before the application of the pollen-tube. 
Fig. 7. An ovule, to which the pollen-tube has been attached for some time. The central 
excavation is now very distinct, and the grumous globular mass has disappeared. 
Fig. 8. An ovule, with its boyau, showing the termination of the boyau within the fissure. 
Fig. 9. A longitudinal section of the corona staminea and sexual organs of the same species, 
the floral envelopes being removed, with the exception of their bases, to show the 
course of the cord from the pollinia to the placente. 
