Brassica Crosses. 



of the species or varieties which had not naturally intercrossed in the previous 

 experiment, might do so when the flowers were artificially pollinated. 



The Brassicas selected for this experiment are shown on Plate 3, and consist of : 

 Fig. 16. Colza Rape (Brassica campestris, L., var. oleifera, DC.). Resembles 

 the Swede in its glaucous leaves, which when young are hispid, but its 

 flowers are bright canary-yellow. 



17. Ragged Jack Kale. A plant resembling in general 



character the Colza Rape and Asparagus Kale, but b - ht canary . 



with laciniated leaves. 



Flowers 



yellow. 



,, 18. Asparagus Kale closely allied to Colza Rape. 



., 19. Kohl Rabi (Brassica oleracea, L., caulo-rapa). \ The flowers of these 



three types are 

 20. Thousand-headed Kale (Brassica oleracea, L., | a i most a jjk e an( j 



o^phala). of a pa]e yellow 



,, 21. Drumhead Cabbage (B. oleracea, 'L., capitata). i colour. 



Swede Turnips, viz. : 



,, 22. Purple-top Round White-fleshed (Brassica campestris, L., var. Napo- 

 brassica communis, DC.). 



Flowers bright canary-colour. 



23. Purple-top Round Yellow-fleshed ] Brassica campestris, L., var. Napo- 

 24. Tankard ) brassicaRittabaga,DG. 



Flowers pale buff-colour. 



Turnips, viz. : 



, i Green-top Yellow-fleshed ) 



,, 25. ] v .. a , , I ? Brassica Rapa, L. 



( Purple-top Yellow-fleshed ) 



Flowers pale buff-colour. 



26. Purple-top White-fleshed 



Brassica Rapa, L. 

 27. Green-top White-fleshed 



Flowers bright canary-colour. 



From this point I had the advantage of the able assistance of Professor 

 Percival, who personally emasculated the blooms and applied the desired pollen. 



The chief objects we had in view were : 



(1) To determine which varieties of Brassica, would cross with each other, 



and whether the plants of the first filial generation (F 1) were fertile 

 or sterile. 



(2) To draw such conclusions as might be possible from results thus obtained 



concerning the origin of the principal distinct types of Swedes and 

 Turnips, and more especially to ascertain whether the White-fleshed 

 and Yellow-fleshed Swedes had a common origin, as also the White- 

 fleshed and Yellow-fleshed Turnips. 



