jonSll Sht'lSI] ^oyal Microscopical Society, 1 63 
as well as of the anastomosis in those parts where the junction is 
effected. 
Buhus fruticosus (Blackberry) shows the junction, into one, of 
two of the lateral leaflets of an otherwise true quinate leaf. The 
change in the direction, size, and number of the primary veins in 
the sutural region is well marked. This metamorphosis is very 
common. Plate Y., D. 
In Bosa canina (Diagram B, Plate Y.) I have occasionally 
found the terminal leaflet assuming the form and character of two 
netted leaves united into one, forming a true hilobed leaf. 
The same kind of change, but still less common, occurs in Fha- 
seolus multiflorus (Scarlet-runner), from the smaller divergence of 
the costae of which, less room is left for the development of the 
normal venation in the anastomosing space. 
In Bubus Iddeus (Easpberry) it is common to find the upper 
lateral leaflet joined to the terminal one. Plate Y. The normal 
arrangement of the leaflets in this leaf is for each to be separate 
throughout its whole extent. 
Of Lobed Leaves. 
By a lobed leaf is to be understood a leaf which has one single 
blade, but which is partly divided into a determinate number of seg- 
ments. We say hilohus, two-lobed, as in the leaf of Bauhinia 
porrecta; trilohus, three-lobed, as in the leaf of Anemone hejpatica; 
quinque-lohatus, five-lobed, as in the leaf of Sycamore ; and so on. 
The recesses between the lobes are of various depths, and terms 
have been employed to distinguish them. When a leaf is divided 
nearly to the base, it is said to be split (fissus). We say bifidus, 
split in two ; trifidus, split in three. When the segments are very 
numerous, multijidus is used. The word " parted " {partitus) has 
the same meaning. 
Examples of the lobed leaf are found in Sycamore, Hoj), Vine, 
Ivy, Bed currant. Maple, &c. 
Such is the construction usually put on this class of leaves — a 
single expansion of leafy matter, containing a homogeneous network 
of veins, traversed by a few larger ones, called ribs (costae), and 
divided in a thousand ways at the margin, giving rise to important 
characters, by which they may be distinguished the one from the 
other. 
The complicated forms assumed by lobed leaves, together with 
the intricate, and often indefinite, course taken by their veins, have 
always proved to me a source of perplexity ; and I have repeatedly 
attempted to find a clue to their interpretation, so that theh outline 
might be reduced to some definite plan, on the one hand, and the 
ramification of their veins unravelled in conformity with some fixed 
design, on the other. These two difficult botanical problems would 
