lbs. ozs. grs.
1. _Water_, composed of oxygen and 111 0 0
hydrogen gases
2. _Gelatin_, of which the walls of 15 6 0
the cells and many tissues of the body,
as the skin and bones, are principally
composed
3. _Fat_, which constitutes the 12 0 0
adipose tissue
4. _Phosphate of Lime_, forming the 5 13 0
principal part of the earthy matter of
the bones
5. _Fibrin_, forming the muscles and 4 4 0
the clot and globules of the blood
6. _Albumen_, found in the blood and 4 3 0
nerves
7. _Carbonate of Lime_, also entering 1 0 0
into the composition of bone
8. _Chloride of Sodium_, common salt 0 3 376
9. _Fluoride of Calcium_, found in the 0 3 0
bones
10. _Sulphate of Soda_ 0 1 170
11. _Carbonate of Soda_ 0 1 72
12. _Phosphate of Soda_ 0 0 400
13. _Sulphate of Potash_ 0 0 400
14. _Peroxide of Iron_ 0 0 150
15. _Phosphate of Potash_ 0 0 100
16. _Phosphate of Magnesia_ 0 0 75
17. _Chloride of Potassium_ 0 0 10
18. _Silica_ 0 0 3
154 0 0
These compounds, in passing away from the body, form many others, which
may be here left out of consideration as not forming a necessary part of
the fabric of the human body.
None of these constituents of the body remain permanently in the system,
and whilst the old particles are being removed new ones are supplied by
the food. It is calculated that in this way a quantity of material,
equal to the weight of the whole body, is carried away every forty days.
So that we may be said to moult or cast away our old body and get a new
one every forty days.
The materials for the food of man, and containing the above elements, are
derived from the mineral, vegetable, and animal kingdoms. The vegetable
kingdom, however, is the great source of food to man and animals, as it
is in the cells of the plant that the elements undergo those chemical
changes which fit them for food. The animal can only supply what it
obtains from them, and the substances supplied by the animal kingdom as
food are identical with those obtained from plants.
The FOOD COLLECTION is arranged as nearly as possible in the order of the
following CLASSIFICATION, commencing at the _western end_ of the lower
gallery.