attributes to Scitaminese and Orchideae one which he calls 
hinoideum. But he does not exemplify the application of 
the terms to practice. 
Professor Oken, of Jena, has also distinguished two 
sorts of leaves, the differences of which depend upon their 
venation; the one is that of Monocotyledones, to which 
he applies the common name of Blatt, the other is the leaf 
of Dicotyledones, which he terms Laub, and which he 
considers a higher degree of evolution ; and, fully aware of 
the great importance that attaches to these two forms, he 
has made them part* of the basis of his metaphysical 
system of plants. 
We therefore trust that enough has been said to shew 
that we are not singular in our opinion of the value which is 
to be ascribed to peculiarities of venation. It may be said 
we wish to carry the idea further than any of the authorities 
now cited; which we are far from denying. On the 
contrary, we think that the nomenclature of veins which 
we have attempted to establish will give facilities which 
have long been wanted for distinctly characterising leaves, 
and that nothing but the want of such facilities has been 
the cause of the subject having hitherto met with little 
attention. A reference to the works of Decandolle and 
Link will shew how imperfect are their definitions of the 
veins of leaves, for want of proper terms, and how difficult, 
under such circumstances, it has been to apply themto 
practice. It is very doubtful, however, whether the dis¬ 
tinguishing byname any other forms of venation than those 
three principal kinds which apply to the chief divisions o 
vegetation is worthy of adoption. Modifications oi these 
are, we think, more conveniently explained by positive 
description than by any particular term. 
