I50 



Introduction to Botany. 



Fig. 75. 

 Guide forms for drawing flowers. See text. 



same thing is illustrated for a cruciferous flower in E, F, 



and G. Compare also the 

 diameters of the three 

 faces of diagram K. 



In drawing long or 

 much-curved leaves it is 

 a good plan to draw the 

 midrib first, and so estab- 

 lish the total length and 

 right curvature; then at 

 a point on the midrib 

 where the leaf is broadest 

 a line should be drawn at 

 right angles with the 

 midrib, establishing the 

 breadth of the leaf in 



right proportion to the length. . Last, the outline of the 



leaf should be drawn, and the venation put in {d, Fig. 76). 



If the leaf is divided or com- 

 pounded, the general outline of 



the leaf and the veins or midribs 



of the leaflets should be made as 



already directed, and then the 



outlines of the leaflets should 



be drawn, as in e, Fig. 76. 



All guide lines should, of 



course, be drawn with a very 



light touch, and erased after the 



flowers and leaves have been 



outlined. 



122. With a sharp knife make cross and vertical sections 



of the ovary, and draw to a scale sufficiently large to show 



the manner of attachment of the ovules (in c and d, Fig. 74). 



Fig. 76. 



Guide forms for drawing leaves. 

 See text. 



