TUBERS WITHIN TUBERS OF SOLANUM TUBEROSUM 



F. C. STEWART 



New York State Agricultural Experiment Station, Geneva 



At the New York Agricultural Experiment Station, in 1915, 

 several bushels of seed potatoes not needed for the spring planting 

 were left over summer in a cellar. The potatoes were of the variety 

 Sir Walter Raleigh. They were stored in slatted crates which were 

 piled one above another three crates deep in a single row along the 

 cellar wall. The cellar was cool, moderately damp and dimly lighted. 

 Its floor and walls were of cement. 



Fig. I. A new tuber protruding from a slit in the side of an old seed tuber of 

 Solanum tuberosum. Nat. size. 



No attention was given the potatoes until the latter part of Sep- 

 tember. It was then observed that instead of producing sprouts in 

 the usual manner they had formed large numbers of new tubers. 

 Some of the new tubers were in sessile clusters of several small tubers 



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