THE SWEET POTATO. 43 



In Tables XXX and XXXI we find another exam- 

 ple in the storing of Georgia Buck in the usual way 

 (straw, corn-stalks, etc.). They analyzed: 



Water. Starch. Glucose. Sucrose. 



Per cent. Per cent. Per cent. Per cent. 



November 28 75.35 13.13 .77 4.31 



January 7 69.52 13.51 1.74 7.66 



March 1 75.80 9.88 3.21 3.77 



These three, of course, do not seem to be in accord. 

 We can easily find quite a number of similar cases 

 in other tables of the same bulletin. Now, the 

 writer's purpose is not to criticise the experiments — 

 they are a step in the right direction — but it should 

 be emphasized that, with such individual differences 

 as these occurring in the analyses, we can hardly be 

 too careful in explaining the results of others which 

 agree more or less. 



It seems clear, however, from the -tables given in 

 the bulletin, that sweet potatoes lose a large part 

 of their starch on storing, and that they gain in 

 sugar. Bulletin 36 of the Texas station gives these 

 extremes of variation in sugai- contents : 



Invert Total 

 Variety. Time of Analysis. Sugar. Sugar. 



Per cent. Per cent. 



Tennessee November 1, 1893-94 2.19 2.77 



Early Bunch Yam March 6,1894 7.25 19.71 



The extremes in starch contents, as taken from the 

 South Carolina Bulletins 63 and 28, are : 



Spanish, some months after harvest, 29.58 per cent. 



Georgia Buck, January 7, stored in straw in a cov- 

 ered house, 7.20 per cent. 



In South Carolina Bulletin 28, Mr. Shiver com- 

 pares the probable yield of starch per acre with that 

 from wheat and corn, in the following table : 



