SPECIAL TECHNIQUES 95 



at the left of Fig. 21 which are outside the range of ordinary 

 HGC. We accordingly examine Riley's table to see what 

 other characters are varying and to see how these two ex- 

 treme individuals fit into this other variation. There are 

 five such characters, each one of which Riley scored in three 

 grades. We add these to our large dots (each one of which 



7 8 9 10 11 



Petal size »- 



Fig. 20. Pictorialized diagram of 23 plants of 7m hexagona var. giganti- 

 caerulea, scored by the symbols shown in Fig. 23 from H. P. Riley's 



published data. 



represents an individual plant) by using much smaller bars 

 at five different positions around their circumferences. Tube 

 color is represented directly above, petal shape horizontally 

 to the right, stamen exsertion directly below, style ap- 

 pendages horizontally to the left, and the presence of a crest 

 diagonally to the left. Each of these characters can be repre- 

 sented with no bars for one extreme grade, with a short bar 

 for an intermediate development, and with a long bar for 

 the other extreme. 



On the hypothesis that, if redness and small petal size came 

 into this population from the same source, other characters 



