LEAVES. 87 
Notice that the leaf is traversed lengthwise by a strong midrib and 
that many so-called veins run from this to the margin. Are these veins 
parallel? Hold the leaf up toward the light and see how the main veins 
are connected by smaller veinlets. Examine with your glass the leaf as 
held to the light and make a careful sketch of portions of one or two 
veins and the intersecting veinlets. How is the course of the veins 
shown on the upper surface of the leaf ? 
ees rg 
<i i A aoe ae 
Sore WO s. 
Fie. 66.—Shapes of 
Margins of Leaves. 
a (1), finely serrate; (2), 
coarsely serrate; (3), 
doubly serrate. 6 (1), 
finely dentate; (2), 
Sinuate dentate; (3), 
doubly dentate. c, 
deeply sinuate. d. 
é 
Wavy. e (1), crenate Fic. 67. — Netted Veining 
or scalloped; (2), (pinnate) in the Leaf of 
doubly crenate. the Foxglove. 
Examine both surfaces of the leaf with the glass and look for hairs 
distributed on the surfaces. Describe the manner in which the hairs are 
arranged. . 
The various forms of leaves are classed and described by 
botanists with great minuteness,! not simply for the study of 
1 See Kerner and Oliver’s Natural History of Plants, vol. I, pp. 623-637. 
