Not only does food supply the daily waste of the human body, but, as the body increases in size from birth to adult age, it is supplied with materials for this increase by the aid of food. In order, therefore, to understand the value of food from its composition, it is necessary to know the composition of the human body. Just as any other compound substance can be submitted to chemical analysis and the elements of which it consists ascertained, so can the composition of the human body be discovered. Such analyses of course become difficult in proportion to the complication of the body analysed, and only an approach to the true quantities in which the elements exist can be expected. In Case No. 1, Division A., the results of such an analysis have been attempted, and the quantities of each element entering into the composition of a human body weighing 11 stone or 154 pounds are (as far as possible) presented to the eye. The following are the elements and their quantities:— ULTIMATE ELEMENTS OF THE HUMAN BODY. lbs. ozs. grs. 1. _Oxygen_, a gas. The quantity 111 0 0 contained in the body would occupy a space equal to 1,314 cubic feet 2. _Carbon_, a solid. When obtained 21 0 0 from animals it is called animal charcoal 3. _Hydrogen_, a gas. The lightest 14 0 0 body in nature. The quantity present would occupy about 2,622 cubic feet 4. _Nitrogen_, a gas. It would 3 9 0 occupy, when free, about 46 cubic feet 5. _Calcium_, a solid. The metallic 2 0 0 base of lime which has not yet been obtained in sufficient quantity to be employed in the arts. It is about the density of aluminium 6. _Phosphorus_, a solid. This 1 12 190 substance is so inflammable that it can only be kept in water 7. _Chlorine_, a gas. When combined 0 2 382 with sodium it forms common salt 8. _Sulphur_, a solid. A well-known 0 2 219 substance. It unites with hydrogen, forming sulphuretted hydrogen, which gives the unpleasant smell to decomposing animal and vegetable matter 9. _Sodium_, a metal. It is so light 0 2 116 that it floats on water, and is kept in naphtha to prevent its oxidation 10. _Fluorine_, a gas. This substance 0 2 0 has not been separated in such a manner as to permit of an examination of its properties, and cannot be exhibited. It is found united with calcium in the bones 11. _Potassium_, a metal. Like sodium 0 0 290 it floats on water, and burns with a flame when placed on it 12. _Iron_, a metal. In small 0 0 100 quantities it is necessary to the health of the body 13. _Magnesium_, a metal. Combined 0 0 12