nN 
Io. 
Il. 
A HARD-WORKING DIET. 
. Carbon, a solid, occurs nearly pure in charcoal. 
The carbon in the body is variously combined 
with other elements, and by its burning sets 
free heat, and produces carbonic acid gas .. 
. Hydrogen, a gas, and the lightest substance 
known. It occurs mainly in water; the 
quantity in the human body would fill a space 
of some 2690 cubic feet, and would weigh 
about... = ee be *e -s 
. Nitrogen, a gas without energetic properties. 
It is an essential part of all bones and blood 
and muscle. The quantity in the body 
would occupy about 66 feet cubic, and would 
weigh about 
. Phosphorus, a solid. It occurs specially in 
various compounds of the bones and of the 
brain. It burns so readily in air that it is 
here kept in water. In the human body we 
find about 
. Sulphur, a yellow combusdbie solid, oe 
called called brimstone. Like all the pre- 
ceding elements, it is found in all the tissues 
and secretions of the body, but always in 
combination. It amounts to 
. Chlorine, a greenish-yellow gas found in the 
body chiefly with sodium, the compound 
being common salt. The chlorine in the 
human body would fill a space of 2 cubic feet 
and 510 cubic inches, and would weigh 
. Fluorine, hardly known in the separate state, 
but probably a gas. It is found united with 
calcium in the bones and the teeth. The 
quantity in the body would fill a space 
2 cubic feet and 150 cubic inches. It would 
weigh 
. Szlicon, a solid occurring in union with oxygen 
in hair, bones, blood, bile, saliva and skin.. 
Calcium, a metal, the basis of lime. It occurs 
chiefly in bones and teeth AC 
Potasstum, a metal, the basis of potash. It is 
lighter than water, and when placed on it 
Ibs. 
18 
14 
V7 
ozs. grs. 
ji) Isfe) 
3150 
wl 
4 150 
