1921. J The Distribution of Wart Disease. 953 



several years, and, when it has been regenerated, has put it 

 on the market under another name. That this must have been 

 done very frequently is obvious, as the number of varieties 

 assigned to the Up-to-Date type is up to the present well 

 over twenty. 



(3) Occasionally, promising " rogues " are noted and 

 selected from a field of another variety. These may have been 

 propagated, named, and placed on the market. 



(4) Synonymous varieties occasionally arise through a stock 

 of a new seedling coming on to the market through two distinct 

 channels. A very good example of this is Tinwald Perfection 

 and Eob Roy. These varieties are identical, but the latter was 

 part of a stock of Tinwald which had been overlooked by the 

 raiser and was sold to Mr. McAlister, who placed it on the 

 market under the name of Rob Roy, not knowing that it was 

 already there as Tinwald Perfection. 



(5) Seedlings may arise which are identical in every respect 

 with older varieties or with other seedlings, and there is 

 positive proof of this, e.g., Mr. McKelvie, of Arran Comrade 

 fame, had, among a batch of seedlings, one identical with 

 TJp-to-Date. Mr. Cuthbertson has had from seedballs of Myatt's 

 Ashleaf, seedHngs identical with Snowdrop and Duke of York. 

 Mr. Malthouse sent a seedling to Ormskirk last year which he 

 called " Salopian,'.' which is identical with broad-leaved Ash- 

 leaf. Although seedlings similar to older varieties do arise, we 

 do not know with what frequency. 



That there was a great deal of unreliable information connected 

 with this subject, Snell was well aware. Unnamed seedlings have 

 been sent to Ormskirk to be tested; these were assigned to the 

 Arran Chief type. Yet the parents of one were said to be British 

 Queen and Abundance, and the parents of the other were not 

 known; it was a seedling from a chance " seedball of President." 

 It does not seem possible that two seedlings botanically identical 

 with each other and with Arran Chief could have been produced 

 from parents so widely divergent in character. 



Again, seedlings identical with Up-to-Date have been produced 

 by crossing British Queen with Kerr's Pink, and Up-to-Date with 

 Factor, and yet it is known that the last-named produces no 

 fertile pollen. Up to the end of the 1919 trials, Mr. Snell had 

 noted 33 types, the most important of which are British Queens, 

 King Edward, Up-to-Date, Abundance and Sharpe's Express 

 types. It is interesting to note that the newer immune types 

 contain very few varieties. 



(Concluded.) 



