62 Mr. Darbishire. Experimental Estimation of the [Dec. 7, 



by him.* In the spring of 1905, Mr. Hurst kindly sent me some seeds, the 

 cotyledons of which belonged to the F 3 generation resulting from the cross 

 which he had made. All the seeds were borne on a single plant (No. 31), of 

 which the following is the pedigree, which is copied exactly from the 

 MS. pedigree which Mr. Hurst sent to me with the seeds : — 



" No. 1, ? x Eclipse <J 



B. Queen,t 



WY EG. 

 L r _ J 



(No. 5) EY (FO 



(No. 31) BY~ EG- WY WG (F 2 ) 



EY EG- WY ~~ WG (F 3 ) 



(Sample here) ."J 



I sowed the yellow round seeds of the sample which Mr. Hurst sent me 

 {i.e., the YE cotyledoned plants of the F 3 generation) in the spring of 1905, 

 and harvested F 4 in the autumn of that year. Of this F 4 generation only the 

 YE were, as before, sown in the spring of 1906, and F 5 § was harvested in the 

 autumn of that year. I kept some green round seeds from three plants of 

 this generation, and it was this seed which produced the plants on which I 

 made the crosses the results of which are recorded in this paper. The 

 characters of these three plants are summarised in the following table, which 

 gives the catalogue numbers of the parent plants and of the " green" plants|| 

 raised from their seeds, the numbers of the various kinds of seeds borne on 

 the three parent plants, etc.: — 



Catalogue numbers of — 



Number of seeds borne by 

 parent plant. 



Number 



of 



green seeds 

 sown. 



Number 

 of 



plants raised. 



Parent plant. 



Sowing of 

 green seeds borne 

 on it. 



YE. 



YW. 



GE. 



GW. 



B55.13 



483 



58 





21 





7 



7 



B54.180 



484 



29 



9 



7 



2 



6 



5 



B54.183 



485 



41 





14 





12 



11 



* ' Journ. E. Horticultural Soc.,' vol. 28, pp. 483—494. 

 + British Queen. 



\ Y signifies yellow, G green, E round, and W wrinkled. Mr. Hurst writes the shape 

 of the seed first. Throughout the present paper, however, the colour is written first. 



§ The proportions of "yellows," " greens," " rounds," and " wrinkleds " in these genera- 

 tions will be published at a later date. 



|| By a " green " plant I mean one raised from a seed with green cotyledons. 



