GRAPHIC ILLUSTRATIONS OF VARIATION. 



19 



individual plants of a new Fife wheat, which liad been closely selected 

 to type for some years, as they stood consecutively in a nursery cent- 

 gener where each j)lant had 16 scpiare inches of room. The vertical 



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 OOOOOOOO---'--'- ■ ' • • ■ • ■ ' ■ ' " • ~ " 



K Plant No'a 



Fig. i. — Yields, in grams, of 80 plants of Blue Stem wheat, arraiigred in order as numbered. 



lines to the point where they are intersected by the curve represent 

 the yields in grams, as shown bj^ the figures standing at the left of the 

 horizontal lines, the distances between Avhich represent half a gram. 



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 h- Plant No's. 



F:<i. 5.— Yields, in grams, of 80 Blue Stem wheat plants (the same as shown in fig. 4), arranged in 



the order of yield. 



In figure 3 these plants have been arranged in the order of their yield, 

 displaying the curves. In figures 4 and 5, in like manner, are shown 

 the yields of 8(J Blue Stem plants, also long bred to a uniform type. 

 In figures (J and 7, in like manner, are shown the yields of 86 plants 



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° PlajitNo's. 



■■!(;. t). -Yiiihl.s, in Ki'ftm^. "f 8li Pifo-Bluo Stem h.v'orid wlioat jjlants, arraii^ie 1 in oi-dor ;is num 

 bored, much greater variation being shown than in the i)arout varietie ■ illustrated in lig.s. 

 :i and •!. 



of a receiiL hybrid IxMween Fife and I>lue Stem wheats. It will be 

 observed that there is much greater variation among the plants in the 

 hybrid variety than ainong the plants ol" cither pai'cnt variety. Acci- 

 dents happen to many wiieat plains, (^\'en in the carefully ari'anged 



