OF SEVERAL ORGANS. Fe 
cases supply the clue, and in others the regularity of 
form will indicate the nature of the malformation, for 
in those instances where the cup is the result of ex- 
pansion, its margin is more likely to be regular and 
even than in those where the hollow form 1 is the result 
of fusion. 
Cohesion of several organs by their margins :—leaves, &e.—'The 
union of the margins of two or more different 
organs is of more common occurrence than the pre- 
ceding, the leaves being frequently subjected to this 
change. Occasionally, the leaflets of a compound leaf 
have been observed united by their margins, as in the 
strawberry, the white trefoil, and others. Sometimes 
the union takes place by means of the stalks only. I 
have an instance of this in a Pelargonium, in T’ropceolwiv 
majus, and Strelitzia regina ; nm other cases, the whole 
extent of the leaf becomes joined to its neighbour, the 
leaves thus becoming completely united by their edges, 
as in those of Justicia, ovyphylla. M. Clos’ has ob- 
served the same thing in the leaves of the lentil Hrvwin 
lens, conjoined with fasciation of the stem, and many 
other examples might be given. Some of the recorded 
cases are probably “really due to fission of one leaf into 
two rather than to fusion. Although usually the lower 
portions of the leaf are united together, leaving the 
upper parts more or less detached, there are some 
instances in which the margins of the leaf at their 
upper portion have been noticed to be coherent, while 
their lower portions, with their stalks, were completely 
free.” 
Cohesion of the leaves frequently accompanies the 
union of the branches and fasciation as might have 
been anticipated. Moquin cites the fenestrated leaves 
of Dracontium pertusum, as well as some cases of a 
similar kind that are occasionally met with, as instances 
' D. C., ‘Organ. Végét.,’ pl. xvii, fig. 3, and pl. xlviii, fig. 2 
2 «Mém. Acad. Toulouse,’ 1862. 
> Bonnet, ‘ Recherches Us. feuill.” pl. xxi, fig. 2. 
