106 



DISEASES OF FIELD & GARDEN CROPS. [CH. 



this has a central mid-rib, and the inner one is termed 

 the pale (meaning also chaff), with two distinct side ribs 

 and no mid rib. 



If the parts of a ripe spikelet are compacted together so 



' I 'X 2 



FIG. 40. 

 Spikelet of Wheat. Twice the size of nature. 



that they will not break away under the knife, and a 

 horizontal section is made through all the fruits or grains 

 with their enclosing chaffy scales, the parts of the spikelet 

 will be seen as in the section at Fig. 41, enlarged four 



D C 



FIG. 41. 



Horizontal Section through a Spikelet of Wheat, showing the grains, 

 scales, etc. Enlarged 4 diameters. 



diameters. We now see in horizontal section the central 

 abortive growth at A, and the four normal grains, 1, 2, 

 3, and 4, each enclosed within a pale, with its two side 



