406 
JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
Mr. Baker, in his paper already referred to, speaks of Solanitvi 
etuherosum as probably only a variety of Solanicm tuberosum. 
I have not myself observed anything in this Potato denoting 
that it was deserving of cultivation either on its own account 
or for crossing with the ordinary Solaninii tnherosuvi, which it 
seems so nearly to resemble. 
Illustration No. 14 is the " Papa Amarilla." This Potato 
I received from Mr. Charles ap Thomas, who has spent a great 
part of his life in Peru ; and knowing that I took an interest 
No. IC). l'()TAT(J i r.OM THE lloCKY MOUNTAINS. 
Fig. 44. 
in tracing the history of the cultivated Potato, he offered to 
obtain for me in 1H87 a consignment of tubers of the "Papa 
Amarilla," which is much grown in Peru, and is in some 
respects unlike our own cultivated varieties. After carefully 
growing this variety for eight years, I entertained no doubt that, 
however suited to Peru, it is of no use in this country, where it 
fails to produce a satisfactory crop, and is not free from disease. 
Illustration No. 15 represents a Potato which a correspondent 
saw gi-owing in South Africa, and of which he sent us tubers, 
tliinking it very dilVercMit from any he had seen in England. ^Fhis 
has Ijccn grown at Jicading for seven yeai's, and is distinct from 
