Plate L 



FIG. 9. Mother cells with developing pollen grains from Funkia oratu The 

 illustration shows successive figures from A- E and represents, from the tirst divi- 

 sion of the contents of the mother cell, (A), to near the formation of the four pollen 

 grains, (E). (.\550). After Sachs. 



FiO. 10. Stamen hair of Tradesatntia. Fig. B. Stamen hair showing general 

 form and relations of cells. A, cell of proximal end: B. nucleus, (x'20.) Kig. A. 

 Cell much enlarged. A, outer wall of cell; B, nucleus and contained nucleolus; C, 

 stream of living protoplasm. (x280.) 



