10 Brassica Crosses. 



2. Forms of Brassica oleracea, L. (all of which have smooth glaucous leaves in 



all stages of their growth), did not cross with those of Turnip (Brassica Rapa, 

 L.), Swede Turnips (Brassica carnpestris, L., var. Napo-brassica, DC.), or various 

 kinds of oil-yielding Eapes, all of which have hispid leaves when young. 



3. No form of Rape was met with which had smooth leaves. 



4. Rapes, Turnips, and Swedes cross readily with each other. 



The plants obtained by crossing the (hispid green-leaved) Turnip with 



the (hispid glaucous-leaved) Swede proved sterile. 

 The Turnip and Swede-Turnip are no doubt specifically distinct. 

 Ragged Jack Kale and Asparagus Kale produce fertile crosses with Swede. 



All have hispid glaucous leaves when young. 



5. The so-called " Hybrid " yellow-fleshed Turnip cannot have been obtained 



by crossing the Swede with the Turnip. 



6. The relationship between the white- and the yellow-fleshed forms, both of 



Turnips and Swedes, is still unsettled. 



7. Several of the crosses and their progeny exhibit simple Mendelian phenomena, 



but there are many points connected with the occurrences of new features, 

 such as novel colour and altered form of leaf, in the segregates of F 2, which 

 are not clearly understood. 



The peculiar and apparently distinct character of " fleshiness " possessed 

 by the seedsmen's specially selected forms of " roots " is very much reduced 

 in the F 1 plants, and its occurrence in these may be readily confused with 

 increased vigour of stem. It returns, however, in the F 2 generation in 

 increased intensity, but none of these plants seem to possess it in the same 

 degree as the original parents of the cross. 



In the crosses where the green Drumhead Cabbage was one of the parents, 

 a few plants having purple foliage were met with in the F 2 generation. 

 In preparing this paper for publication in the Society's Journal, I have had 

 the vahied help of Professor Percival. 



EXPLANATION OF THE PLATES. 



PLATE 1. 

 Fig. 1. Green Kale. Fig. 6. Drumhead Field Cabbage. 



2. Variegated Kale. 7. Garden Cabbage. 



3. Thousand-headed Kale. 8. Red Cabbage. 



4. Savoy. 9. Couve Tronchuda. 



5. Brussels Sprouts. 



PLATE 2. 

 Fig. 10. A Brussels Sprouts plant with Cabbage head. 



11. A new hardy curled form of Thousand-headed Kale. 



12. A plant of the habit of Thousand-headed Kale, but having very white and tender 



leaf-stalks of the nature of Couve Tronchuda. 



13. A heading or hearting form of Couve Tronchuda. 



14. True Thousand- headed Kale (for comparison). 



15. True Couve Tronchuda (for comparison). 



