8. A pollen -mass of Ophrys apifera with its caudicula and gland 
magnified 15 times ; the gland is in the act of parting with the 
fecundating matter of the pollen. 
9. A view of the upper surface of the gland^ with the mode of insertion 
of the caudicula. 
10. A view of the under surface of the same, shewing a cavity which 
communicates with the foot of the caudicula. 
11. A section of the pouch, shewing the positions of the gland, the 
caudicula and the foramen. 
12. A portion of the granules of the pollen-mass of Orchis mascula; 
magnified 50 times. This shews that all the granulations cohere 
by the means of a common elastic web, which is shewn forcibly 
distended, and that each granulation is composed of a number of 
series of particles of pollen. 
13. One of the granulations in its natural state ; magnified 100 times. 
14. The same partially dissolved in water, its component particles sepa- 
rating in threes, fours, pairs, and very minute simple molecules. 
15. A back view of the double pouch of the column of Ophrys apifera 
shewing the wide foramina at the back of each pouch for maintain- 
ing the communication between the pollen-masses and the stigma ; 
magnified 15 times. 
16. A section of fig. 1, shewing the relative position of the anther, pouch, 
gland, stigma, and ovarium of Orchis mascula when the flower is 
expanded. 
