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growth; in fact, they are often shy budders. Frost 

 affects them readily, and they possess small recuperative 

 powers after it. Vigour is usually associated with 

 strong disease-resisting properties, but not always. 



Fixity of Type. 



Some varieties are liable to lose their distinctive 

 features. The type is not sufficiently fixed. This is 

 perhaps most common in those varieties which are 

 hybrids of red stocks. When this is shown it is 

 usually found that the variations are inferior to the 

 variety when first introduced ; the tubers are smaller, 

 and show a tendency to " kindle " or produce a large 

 number of very small chats. 



Second Growth. 



Second growth, after-growth, super-tuberation, or 

 growing-on are terms used to denote that the growth 

 has not been uniform throughout. Some varieties are 

 especially liable to this detrimental feature. It is most 

 common among kidney varieties, especially when from 

 various causes the seed becomes deficient in vigour. 

 The kidney potatoes show it in the form of a dumb- 

 bell, variously spoken of as " lady-waisted," " waspy," 

 " dollies," etc. The round varieties more often show 

 it in the form of warty excrescences, which may be 

 broken off, though not always. Some very vigorous: 

 varieties, such as the Imperator, when first introduced, 

 throw out from a newly-formed tuber a cord of varying 

 length, which is similar in all respects to the stem carry- 



