776 



EXPERIMENT STATION RECORD. 



iu 1891; and of 8 grown iu Virginia, 4 in Connecticut, 7 iu Michigan, 

 10 in New York, and 1 in Kansas, analyzed in 1893; the dry matter 

 otlier than starch of 1 varieties grown iu Virginia, 3 in Couuecticut, 

 and 3 in Michigan, crops of both years, and tlie ash constituents of 

 varieties analyzed in 1893. In the second bulletin comparisons of these 

 data are made for the several States and for difierent sections; maxima 

 and minima and averages of ingredients in all varieties from the sev- 

 eral States are given, and additional ash analyses tabulated of 20 

 varieties grown in 1893 in other States. 



"The data accuuiuliited are yet iiisufficieut to make very positive statements, inas- 

 mucli as it will require the cultivation of the tuber iu the several States under as 

 nearly the same conditions as possible, with the study of the soil from a mechanical 

 and chemical standpoint, and also a continuation of the work througli a series of 

 years before definite conclusions can be reached.'" 



The following table shows the variation which may exist in the same 

 variety grown iu different parts of the same State: 



Variation in the same variety of potatoes (jroivn in different purtfi of Michiyan in 1S93. 



Variety. 



Specific 

 gravity. 



Early Rose grown at Lansing 



Early Rose grown at Grand Rapids 



Average 



Beauty of Hebron 



Do 



Average 



1. 070 

 1.086 

 1.078 

 1.071 

 1.084 

 1.078 



From the tabulated starch content of the varieties from different 

 States it appears that the Kansas-grown sample ot Triumph contained 

 but 8.15 jjer cent, while Beauty of Hebron from Massachusetts con- 

 tained 20.89 per cent, and that Dakota Red grown in Virginia contained 

 9.75 per cent, while growu iu Canada it contained 14.29 per cent. The 

 averages for the several varieties including compiled analyses from 

 Kentucky, Colorado, and Canada are: Beauty of Hebron 17.13 per 

 cent, Charles Downing 10.32, Pearl of Savoy 16.05, Climax 15.59, Early 

 Rose 15.40, Green Mountain 15.24, Early Ohio 15.03, Burbank 14.69, 

 Sunrise 14.54, Minister 14.26, Triumph 13.96, and Dakota Red 12.40. 



So far as the author's work has gone he believes the following con- 

 clusions may be drawn: 



"(1) The ratio . . . existing between the specific gravity and starch is not a 

 fixed one. . . . Connecticut shows a lower specific gravity and a higher percentage 

 of starch by about 2 per cent than the Virginia-grown varieties. 



"(2) The value of the potato . . . based upon the amount of starch contained 

 is very nearly the same . . . for the 3 districts, northern, western, and southern. 

 The difference is slightly in favor of the northern-grown varieties, the southern 

 varieties being slightly more valuable than the western. 



'■(3) The starch content varies for variety and locality. 



"(4) Some varieties require more plant food thau others, other conditions being 

 the same," 



