354 



953. The composition of good potatoes varies from 

 about 10 to 25 starch, 3 to 8 fibre, 2 to 4 gum, 1 to 

 2 azotized matters (albumen, &c.) and 70 to 80 parts 

 of water per cent. 



954. According to Sprengel, 100,000 parts of dry 

 potato tuber contain 2653 parts; and 100,000 of 

 potato haulm, 4786 parts of inorganic matter, con- 

 sisting of — 



Potash 



Soda 



Lime 



Magnesia 



Alumina 



Oxide of iron 



Oxide of manganese 



Silica 



Sulphuric acid 



Phosphoric acid 



Chlorine 



2653 



4786 



955. The batatas or sweet potato of the West India 

 Islands, contains, according to 0. Henry — 



