BOTANIC MATERIA MEDICA, 169 
beautiful appearance of the handiwork of our 
divine Creator, whilst others, again, have only 
parallel veins running through them, as in the 
plantain, corn, palms, etc. Leaves are said to 
be compound when made up of leaflets, as in the 
rose, wistaria, locust, etc; in their arrangement 
along the petiole they occur as pinnate, bi and 
_ tri-pinnate (once, twice, and thrice winged), 
Compound leaves are also found palmately di- 
vided (5 divisions, resembling the hand), and 
these again are found divided into twos and 
threes, and are known as bi and tri-palmate, 
The texture of leaves is either succulent (fleshy), 
coriaceous (leathery), or rugous (wrinkled) ; 
they are either sessile (without petioles) or pe- 
tioled, and partake of all kinds of geometrical 
curves, Leaves are said to be deciduous when 
they last only one season, as is the case with 
our willows, maples, oaks, and shade trees of 
like order; permanent, as in the pine, cedar, 
magnolia, andlaurel. Although they shed their 
leaves every season, still, at no time are they 
denuded of their foliage, because they are re- 
newed at once. 
We will speak of leaves and leaflets, their uses 
and doses, also their mode of arrangement on 
the particular plant or tree upon which they 
grow, under their respective headings. 
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