194 PRODUCTION OF TUBERS WITHIN THE POTATO, 
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ducing roots is so deeply gr 
bearing shoots that it continues even when roots are useless. 
ntion to a case somewhat 
parallel physiologically, where supply of soluble food-material goes 
on after the necessity for it has ceased as far as the plant is con- 
cerned. e Indians of Mexico have discovered and use it for 
their own convenience. They cut off the inflorescence of the Agare 
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wound into a sort of basin. Of course a large supply of soluble 
carbohydrate (sugar) was necessary for the very active metabolism 
and growth going on in the huge opening inflorescence. This 
i the 
by the Indians and fermented to make a drink. This goes on until 
the plant has exhausted the large quantities of starch which it 
had stored in ee sores with a view to flowering and fruiting. 
es. 
There is one other point worthy of mention as regards the 
relation between the two generations of tubers. In a paper entitled * 
example of an internal wound found in a kind of dry-rot of the 
potato, and induced through penetration by a parasite. The pene- 
* Pringsheim’s Jahrbuch, Ba. xii. p- 138, 
