THE STUDY OF TYPICAL KLOVVKRS 195 



which escapes from the anther-cells and adheres to paper or to the 

 fingers. Examine a newly opened anther with the microscope, using 

 the two-inch objective, and sketch it. 



Cut away all the stamens and note the two portions of the pistil, 

 a triangular prism, the ovary, and three roughened scroll-like objects 

 at the top, the three lobes of the stigma. Make a sketch of these 

 parts about twice natural size, and label them x 2. Touch a small 

 earners-hair pencil to one of the anthers, and then transfer the pollen 

 thus removed to the stigma. This operation is merely an imitation 

 of the work done by insects which visit the flowers out of doors. 

 Does the pollen cling readily to the rough stigmatic surface ? Examine 

 this adhering pollen with the two-inch objective, and sketch a few 

 grains of it, together with the bit of the stigma to which it clings. 

 Compare this drawing with Fig. 162. Make a cross-section of the 

 ovary about midway of its length, and sketch the section as seen 

 through the magnifying glass. Label the three chambers shown 

 cells of the ovary l or locules, and the white egg-shaped objects within 

 ovules. 2 



Make a longitudinal section of another ovary, taking pains to 

 secure a good view of the ovules, and sketch as seen through the 

 magnifying glass. 



Making use of the information already gained and the cross- 

 section of the ovary as sketched, construct a diagram of a cross- 

 section of the entire flower on the same general plan as those shown 

 in Fig. 157. 3 



Split a flower lengthwise, 4 and construct a longitudinal section of 

 the entire flower on the plan of those shown in Fig. 155, but showing 

 the contents of the ovary. 



207. The Flower of the Buttercup. Make a diagram of the 

 mature flower as seen in a side view, looking a little down into it. 

 Label the pale greenish-yellow, hairy, outermost parts sepals, and 



1 Notice that the word cell here means a comparatively large cavity, and is 

 not used in the same sense in which we speak of a wood-cell or a pith-cell. 



2 The section will be more satisfactory if made from an older flower, grown 

 out of doors, from which the perianth has fallen. In this case label the con- 

 tained objects seeds. 



8 Consult also the footnote on p. 193. 



4 One will do for an entire division of the class. 



