"The food we consume serves us in two ways; first it supplies material for tissue and also for the bones; second, it furnishes us fuel for bodily warmth and action."

What Foods Are Required For These Purposes?

"While most writers divide foods into many classes, practically there are only two, that is, foods for building or repairing the body and foods for furnishing heat or force."

"Then you would only divide food into two classes."

"Yes, foods for building or repairing the body are called tissue-forming foods, they are also known by other names which are used to express the same thing."

What Are The Names?

"The most common name applied totissue-formingfood is the term proteid, or protein. Another term almost equally well-known if that of nitrogen or nitrogenous foods. Stil! another known as albumens or albumenoids. These various names are used interchangeably for the same purpose, and the reader should not be confused thereby."

What Foods Belong To This Class?

"Lean meat, eggs, fish, milk and cheese are the foods most extensively known as tissue forming foods, but peas, beans, lentils and wheat gluten have a larger per cent of tissue-forming substances in proportion to their starch, than is ordinarily required for the human system. Properly speaking, they should be classed with tissue formers."

What Foods Are Known As Fat Or Heat Producers?

"All fats and oils, starch, sugar, gum, pectose and waste material are all termed force producers. The foods belonging to the starchy class, including gums and waste material are usually termed carbo-hydrates, while the fats are known as hydro-carbons."

In What Classes Of Food Do We Find These Different Properties?

"All the animal fats and oils, vegetable and fruit oils, sugar, starch and vegetables generally "

Are There Any Foods That Belong To Both Classes?

"Yes, many of the foods in common use belong to both classes, that is, are both tissue formers and. force producers. Milk, meat and eggs, all contain fat, and are therefore force producers by reason of the fat they contain, while the cereals, especially wheat and oats, contain nearly the proper proportion of tissue forming and heat producing substances. Ordinarily, the animal foods are called nitrogenous and the vegetables non-nitrogenous or heat producers."

I Understand That The System Contains Much Mineral Matter, That The Bones Are Substantially All Composed Of It. Where Does The Supply Come From?

"The largest element of bone formation is lime, called calcium, while salt known as chloride of sodium, potash known as potasium, magnesia known as magnesium, and suiphur and iron and traces of other minerals", are found in various farts of the body. These various mineral el- ments are usually known as salts, or mineral matter, and exist in various compounds, generally known as chloride, carbonate and phosphate of sodium; chloride, carbonate, sulphate and phosphate of potassium; carbonate, sulphate and phosphate of magnesium; and phosphate of calcium."

Are There Any Other Uses For Mineral Salts, In The Body, Except For Bone Formation?

"Yes, but it would be rather difficult to explain them to the laity."

What Is The Use Then Of All This Description Then?

"Simply to show the necessity of eating food that supplies these elements."

"Then it is a matter of great importance after all."

"Yes, many diseases result from not knowingthisfact."

What Are Some Of Them?

"Rickets in children, anaemia, chlorosis, excessive growth and other ailments."