Potassium salts rank next in importance.[4] Calcium, phosphorus,
sulphur and iron are included in this class.

The quantity of salts or mineral matter contained in some important
articles of vegetable and animal food is shown in this table (Church):

_Mineral Matter in 1,000 lbs. of 14 Vegetable Products._

Lbs.
Apples 4
Rice 5
Wheaten flour 7
Turnips 8
Potatoes 10
Barley 11
Cabbage 12
Bread 12
Watercress 13
Maize 20
Oatmeal 21
Peas 30
Cocoa nibs 36
Wheaten bran 60

_Mineral Matter in 1,000 lbs. of 8 Animal Products._

Lbs.
Fat Pork 5
Cow's milk 7
Eggs (without shells) 13