SOLANACE^ 



579 



table use, or for the industries. For table use, only those 

 tubers should be selected which have small cells (high 

 density), and for starch factories only those with large cells 

 (low density) . Even with the same amount of starch in two 

 varieties, it is found that the large-celled one is the more 

 valuable to the starch industry, due to the fact that in the 

 small-celled varieties a larger number of the cells remain 

 intact and do not give up their starch in the starch-removing 

 process, while with the large-celled varieties fewer starch 

 cells escape being broken up. In France, it was found that 

 rich, compact (heavy) soils produced tubers with a low 

 cellular density, while the lighter soils produced tubers with 

 small cells and high density. 



Chemical Composition of Potatoes.^ — A number of analyses 

 of potatoes have been made in this country and in Europe. 

 Gilmore gives the results of a number of these in the follow- 

 ing table: 



Source 



Cornell 



Maine 



U. S. all sources 



France : 



Coudon and Boussard. 



Coudon and Boussard. 



Coudon and Boussard . 



Coudon and Boussard. 



No. of No. of 

 analyses varieties 



Protein 



43 



l6 



136 



7 

 12 



Starch 



1.899 



2. 170 

 2. 200 



2.676 

 2. 411 



2-365 

 2.090 



17.356 

 18.037 

 18.400 



11.798 

 13.218 

 14. 118 

 16.047 



Quality 



Very good. 

 Very good. 



Very good. 

 Good. 

 Passable. 

 Poor. 



Water and nitrogen increase from the outer to the inner 

 zones, while the starch content decreases. 



The following table showing composition of the potato is 

 from East: 



