390 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



selves are instances of the survival of the fittest, in so far that 

 they were chosen from thousands of less promising seedlings 

 — several of them will doubtless greatly exceed the limit of age 

 reached by older varieties. 



In the Late and Maincrop section nothing has yet approached 

 Magnum Bonum in popularity, and it is quite as good now as 

 when introduced twenty-one years ago. There are many other 

 varieties of a similar character ; but on the closest scrutiny 

 I have failed to detect any point in which they differ from Mag- 

 num Bonum, and I have generally found when any difference 



Fig. 101. — Potato 'Windsor Castle.' 



has been suggested that the varieties in question were not grown 

 alongside under the same conditions, or else that the seed had 

 been obtained from different sources, a change of seed often 

 producing a marked divergence in two rows of the same variety. 



I must not leave the subject of Potatos without mentioning 

 such names as the late James Paterson, Mr. Robert Fenn, the 

 late James Clark, Mr. Archibald Findlay, Mr. A. Dean, and Mr. 

 Chas. Ross, all of whom have devoted many years, perhaps the 

 best years of a lifetime, to the improvement of the noble tuber ; 



