76 STUDY OF COMMON PLANTS. 



4. The extremely long style. 



5. Relative position of anthers and stigma. 



6. Numerical plan. 



II. Make a clean transverse section of the ovary. 

 Examine under the dissecting microscope. How many 

 carpels are there ? 



III. Draw the section, taking care to represent accu- 

 rately 



1. The position of septa and placentae. 



2. Attachment and form of ovules. 



IV. Make an exact longitudinal section and draw it in 

 outline. Note particularly 



1. The conspicuous nectary. 



2. Presence or absence of nectar. 



3. The insertion of the filaments and their direction, so 



placed as to bar out unwelcome visitors. 



V. Measure the length of the calyx tube. Is the nectar 

 accessible to bees and similar insects ? 



VI. Construct a diagram. 



VII. Review the whole and describe in detail. 



PRIMROSE. Primula veris, etc. 



I. Study the morphological characters, such as 



1. The numerical plan. 



2. Regularity. 



3. Symmetry. 



4. Coalescence of parts. 



5. Structure of ovary. 



II. Construct a diagram. 



