106 I. H. Burkill — Mower of Ranunculus arvensis. [No. 2, 



Table XIY. — Average number of other organs in association with 

 1-9 Carpeh. 





Carpels. 



1 



2 



I 



5 



6 



7 



8 



9 





f Kew, Old 





] : j 

 4*75, 4 S4 1-93 



4.97 4-99 



4-99 



5 00 





A verage No. 



of J Kew, New 





4-69| 4'41 1 478 



4 96 4"9& 



5-00 



4-98 



5-00 



Sepals' 



... 1 Rotin 



4-20 



... 4-74 487 



4'94 4-97 



4-97 



5-00 







(.Heidelberg 





4-62 479 4-90 



4'96 4*97 



5-04 



5-06 



500 





(Kew, Old 





1 ! 

 3-38' 3-65 4-06 



4-60 4-85! 495 



4-96 





A verage No. 



of i Kew, New 





3 31; 3-18 3-77 



4 5lU-73 : 4 88 



491 



4 95 



Petals 



... 1 Bonn ... 



366 



... 3*60 3-52 



3 74' 3-94 4 11 



436 







(.Heidelberg 



... 



3-44 318. 3-4.3 



358J403 4-19 



1 i 



409 



4'12 





rKevr, Old 



j ! 

 ... 4-46; 4-61 



I 

 5 35 6-18 



766 



9-44 



1105 





Average No. 



of) Kew, New 



... 3-94J463 



5 22 5-9^ 



716 



8-87 



10 27 



1068 



Stamens 



... J Bonn 



4-90| ... 603 



672 7-28 



8-2S 



918 



957 







(.Heidelberg 



... 5-50 5 84 



637 711 



784 



8-5( 



8-90 



8-50 



I must now point out some differences between the races. 



"When one sepal less than the complete five is present in the Kew 

 race there is approximately one petal less, two stamens less and | carpel 

 less : when two sepals are wanting then we lose further § petal, f stamen 

 and \ carpel. 



In the German races one sepal less than the complete five means 

 roughly § petal less, § stamen and f carpel : when two sepals are 

 wanting we lose a further § petal, 3| stamens, 2| carpels ; i.e., in the 

 German races 4 sepaled flowers are more nearly otherwise normal than 

 in the Kew race : and what is true for the sepals is true for the petals, 

 i.e., that the first reduction in them from normal is much more closely 

 accompanied by a reduction in other organs than is the case in the two 

 German races. 



Apportionment of organs in the Kew race.— The least flower of the 

 Kew race had 8 organs in all, the largest 36. The largest flowers 

 were richest in stamens, the least richest in sepals. I give in table XV 

 the average number of sepals, petals, stamens and carpels in flowers 

 with varying numbers of total organs, and over leaf are curves ex- 

 pressing the result graphically. The result may be briefly stated 

 thus :— if there is power to produce more than 15 organs the sepals 

 claim their full compliment ; if there is power to produce more than 

 20 organs, the petals also claim their full compliment; if there is power 

 to produce more than 28 organs the carpels begin to show signs of 



