A CALORIE
A calorie is the heat unit used in the estimation of the fuel value of various foods. For instance, an ordinary slice of homemade bread contains 100 calories. An ordinary fig contains almost 100 calories. A large orange or an apple or a glass of grape juice contains about 100 calories. There are 100 calories in three teaspoons of sugar or honey.
A complete food list with the estimation of calorie value of foods is found in The Science of Living, page 370, while on page 99 of the same book is a very helpful table showing the amounts of various foods required to equal 100 calories. The reader will find this exceedingly practical in estimating food values for the household.