37 $ Scott Elliot.— On the Fertilisation of South 
and stigmata are widely separated from one another and as 
seen from in front appear as two little projections above the 
lateral wings of the lamina (see Fig. 126, a, c). Honey appears 
to be secreted at the point n, which is a most unusual position, 
corresponding, as it apparently does, to the missing stigma, 
and being exactly behind the middle point of the lamina ; 
the groove already noticed leads down to this point over 
the lateral wings of the labellum, and obviously is the path 
by which an insect’s proboscis much reach the honey. This 
explains the position of the disc which is exactly at the en- 
trance to the groove (see Figs.), and, as may easily be 
shown by making a slender bristle travel down the groove, 
an insect’s proboscis must on withdrawal bring away the disc 
and attached pollinium : when this happens there is a slight 
curvature of the caudicle, bringing the base of the pollinium 
closer to the disc. The pollen-masses are transversely fringed 
and broad at the base, so that they will readily enter the 
galea cavity, but must on withdrawal catch on the stigmatic 
surfaces. What the use of the two pit-like cavities ( n, h) at 
the top of the lamina can be, I was unable to make out. 
Probably visited by some Dipterous insect. 
Angraecum superbum, Pet. Th . (Figs. 127-129.) 
The structure of this flower can be readily understood 
from the figures. The labellum is hood-shaped, and pos- 
sesses a thickened crest (cr) seen in section (Fig. 128) on its 
inner face. There is a pit or ditch excavated in the column 
between the spur entrance and the anther. The latter is 
raised on a round c boss,’ as seen from the outside (really the 
top of the column) ; the disc lies in a narrow groove at the 
highest point of this ‘ boss,’ just in front of the pit and en- 
trance to the spur. The method of fertilisation is very simple. 
An insect must stand on the sepals and petals, and insert its 
proboscis into the spur. As the crest, however, projects so much 
forwards, the proboscis (being also naturally curved) must be 
made to slip over the groove o, and on retraction must take 
off the disc and pollinia. This can easily be verified by means 
