Insectivorous Plants ( Part II). 409 
are of a rather elaborate kind in the above species. It alone 
is well provided with external hairs and with window-like 
areas, though both are shown in a less perfect manner in 
vS. Drummondii. But the distribution of honey on the 
alluring surface is neither so widespread, so perfectly 
disposed, nor so abundant as in other species, so that my 
experience of it in the houses of the Royal Botanic Garden 
of Edinburgh as a rather inferior fly-catcher is probably 
a true index to its capabilities in its natural haunts. In 
making this statement I bear in mind that it was this species 
which Drs. Macbride and Mellichamp have described so 
carefully, but compared with 5. fiava and 5. Drummondii 
I have always found it to be inferior. 
My knowledge is still imperfect regarding gland-secretion. 
That the alluring and lid-glands, as also those on the upper 
part of the conducting surface, secrete a sweet juice, any one 
can satisfy himself. But the function of the glands covering 
the lower conducting and detentive surfaces is more difficult 
to explain, as the secretion is not sweet to the taste. In view 
of the wide distribution of the honey-glands over each leaf 
and parts of the flower, it appears to me, from an evolutionary 
standpoint, quite a likely hypothesis to suppose that all the 
internal glands may originally have secreted a sweet attractive 
juice. In structure the internal glands resemble each other, 
and also the external ones. Now in .S. variolar is no 
separation or isolation of the internal glands into areas is 
observable, though, as already stated, they are rather few 
in number on the conducting, but abundant on the upper 
detentive region. It is quite probable therefore that some 
simpler form is. now lost to us which exhibited a uniform 
distribution of internal glands, all secreting honey. The 
advantage of such an arrangement, especially if correlated 
with a less specialized hair-development, is manifest. But 
vS. variolaris and the other species that are provided with 
glands in the lower conducting area or parts beneath, secrete 
a juice which, according to Mellichamp 1 , is astringent, and 
Gard. Chron.. June 1874. 
