This section is from the book "The Corner Cupboard; Or, Facts For Everybody", by Robert Kemp Philp. Also available from Amazon: The Corner Cupboard; or Facts for Everybody.
Proteinaceous : The casein of the milk - which when separated, is known by the name of cheese - has, in common with two other vegetable and animal substances, called fibrine and albumen, a principle for their basis named protein. These substances form the chief part of the fabric of the body, and in their capacity of food, perform a very different function in the body to the butter and sugar before mentioned.
 
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