220 APPENDIX. 



d. gyncecium, consisting of one carpel; the swollen 

 basal part or pod is the ovary, the elongated portion (the 

 style) ends in the stigma. 



Draw the floral diagram. 



iii. Cut transverse sections of a flower bud of Caltha 

 palustris (the Marsh Marigold) preserved in alcohol. 

 Push the sections of anthers from the razor direct into 

 a drop of glycerine on a clean slide, and cover. Select 

 under the low power a thin section for examination under 

 the high power, and shew on your sketch 



a. the four pollen sacs which eventually fuse into the 

 two lobes of the ripe anther ; [Sketch various stages.] 



b. the fibrous layer under the epidermis, incomplete 

 at the point where fusion of the two pollen sacs of each 

 side commences, that is, on the line of dehiscence ; 



c. the young pollen grains ; 



d. the connective. 



No. XII. 



THE FLOWER (continued) DICHOGAMY. 

 i. Examine a Dog-Daisy (Chrysanthemum leucanthe- 

 mum), noting : 



a. involucre of green bracts ; 



b. white ray florets ; 



c. yellow disc florets. 



Divide the daisy into two by cutting upwards along 

 the middle of the stalk. Sketch the section thus displayed, 

 shewing 



a. receptacle ; 



b. bracts ; 



