CHAP. 

 IV. 



Fig. 41. — Spikelets of the maize plant (much enlarged). A, male spike- 

 let. B, female spikelet. a, anther; b, pore; c, filament; d and e, glumes;/, 

 ovule. (After De Vries, from models by Brendel, Berlin.) 



B C 



Fig. 42. — Pollen grains of maize (much enlarged). A, normal shape of living 

 grains; B, shrunken, "dead" grains ; C, dead grains moistened and allowed to 

 dry again. 



