A VENA SATIVA. 189 



2. The anthers. Tear off bits of the wall of an empty 

 anther. Mount one outside up and the other inside up. 

 Focus on the surface of the first, and note 



a. The epidermis ; its wrinkled walls ; the shape of 

 its cells. Draw. 



Focus on the surface of the second, and note 



b. The emfotJicciuM, the layer of cells lining the 

 anther. Observe 



i. The infolded thickenings of the side walls of 



the cells. 



ii. The shape of the cells, 

 iii. Draw. 



Cut a transverse section through the lower part of a 

 spikelet which has not bloomed, and transverse sections of 

 the anthers will be obtained. Notice 



c. The large inflated epidermal cells. 



d. The very narrow endothecial cells, with the thick- 

 enings of the walls extending the full height, mak- 

 ing it difficult to distinguish their outline. 



e. Draw a few of the two kinds of cells. 

 Under low power, notice 



/. The two lobes of the anther, theca. 



g. The connective which joins them, containing a fibro- 



vascular bundle. 

 //. The four cavities, appearing like two after dehis- 



cence. Usually the manner of dehiscence can 



be detected. 



Using the same section, under high power, notice 



3. The pollen. 



a. The shape of the cells. 



b. The small globular protuberance sometimes seen 

 when the spore lies properly. 



