1902.] 



I. H. Biu'kill — Flower nf Ranunculus arvensis. 



Ill 



Table XVIII. — Keu\ Neiv. Average number of organs in floivers at 

 different periods ; periods as in Table XVII. 





Period 1. 

 6th July to 

 17th July. 



Period 2. 



18th July to 



29th July. 



Period 3. 

 30th July to 

 10th August. 



Period 4. 



11th August 



to 23rd 



August. 



Sepals 

 Petals 

 Stamens 

 Carpels 



499 



4-97 

 11-63 



7-22 



4-99 



4*84 

 7-95 

 6-51 



5-00 

 467 

 614 

 574 



4-77 

 381 

 507 

 436 



Table XIX.— Bonn. 



Average number of organs in flowers at different 

 periods. 





Period 1. 

 June 6th to 

 July 10th. 



Period 2. 

 July 11th to 

 August 29th. 



Period 3. 



August 30th 

 to middle of 

 September. 



Sepals 

 Petals 

 Stamens 

 Carpels 



4-96 

 4-22 

 8-80 

 5-71 



4'92 

 3-43 



774 

 5-58 



4*98 

 3-69 

 685 



4*75 



Table XX. — Heidelberg, Average number of organs in flowers at different 

 periods ; periods as in Table XIX. 





Period 1. 



June 6th to 



July 10th. 



Period 2. 



July 11th to 

 August 29th 



Period 3. 

 August 80th 

 to middle of 

 September. 



Sepals 

 Petals 

 Stamens 

 Carpels 



500 

 392 

 824 

 521 



494 

 370 

 699 

 516 



498 

 3*49 

 7-07 

 5-01 



With this reduction in number of parts there is a reduction in the 

 size of the flower and there is also a loss of fertility in the anthers. 

 This loss of fertility is shown in the following tables. 

 J. ii. 15 



