100 
they belong. Also the base and its nerves appear a little stou- 
ter in 1 than in 1?, the normal shape. 
Figg, 2" and 2> respectively represent the normal and the 
abnormal shapes of Cocculus incanus (fam. Meuispermaceae), in 
which it may be observed, that the midrib has attained the 
ordinary length and the base taken the ordinary shape while 
only the apex has been affected. 
In a slight degree only is the disturbance of the apex to 
be observed in a leaflet‘) of an unknown Bignoniacea (figg. 
3* and 3»), whereas a stronger modification owing to the same 
cause attracts attention in figg. 4* and 4. These leaves belong 
to Coscinium Blumeanum (fam. Menispermeae). A few more leaves, 
which I have preserved in my herbarium, show that in this 
plant the abnormity is not of exceptional occurrence. 
Very curious effects are produced by the sudden checking of 
the midrib in Vitis pallida (fam. Ampelideae) comp. 5* and 5». 
Of the cordate leaf scarcely anything has been left except the 
outline of the base. The lamina is simply split up from one 
end to the other, as also may be seen from the bifurcation 
of the midrib (see fig. 5°). On the other hand each of the 
halves produces an outgrowth, the right half a cup-shaped, 
the left one a less distinctly differentiated appendage. That the 
pitcher is actually produced by the lobe, is quite evident from 
the stalk, which forms a whole with the midrib of that lobe. 
Amongst the abnormal leaves which I brought from Buiten- 
zorg, there is one which I omitted to compare with the normal 
shape. This leaf belongs to a species of Solanum. The peculiar- 
ity consists not so much in the unequal base (fig. 14) as in 
the emarginate apex. This case most probably should be clas- 
sed with those just mentioned, it is however by no means 
impossible that bifurcation of the apex is at the bottom here, 
as in the cases to be described by and by. 
Judging from Mr. Smith’s notes the following are also to 
be classed under this head. 
1) The leaves are binate with a three-branched tendril. 
