108 



second growth cannot be separated from the first 

 growth, and, as the two ends rarely cook evenly, the 

 quality is greatly impaired. Round potatoes produce 

 protuberances which can be easily knocked off, and the 

 quality is less injured. 



Oval potatoes are somewhat long, resembling 

 kidneys, but they are thicker through the cross 

 section at the middle, and taper towards both ends, 

 whereas the rose end of the kidney is thicker than the 

 heel end, and the kidney varieties show a greater 

 tendency to second growth. 



Division by Colour. 



Another division is that of colour of the skin, which 

 is composed of 



White, including those with yellow or brownish 



strains. 

 Coloured, including all shades of red or pink. 



The colour of the flesh, whether white or yellow, 

 may be taken as a section, but the dividing line is 

 very indefinite, as the shades merge into one another, 

 and the matter is so much one of comparison that the 

 division cannot be definitely made. Some varieties, 

 however, are so essentially white, and others so yellow, 

 that a distinction may well be made between them. 



Varieties are sometimes spoken of as disease-resist- 

 ing. This, however, is only a comparative term, as, 

 though the power of resisting disease is much stronger 

 in some varieties than in others, no variety is abso- 

 lutely proof from disease; though for a few years, 



