3i8 
TlMEHRI, 
And to this must be added 
744*ii grammes of Oxygen used from the Air. 
2818 „ of Water. 
32 ,, of Salts. 
Making in all about 7 lbs. of matter consumed in 24 hours. 
The various pprts of a diet have each a special use not 
altogether limited to themselves, but overlapping to 
some extent, as we have noted in the case of a deficiency 
of fats being supplied from the carbohydrates. The 
nitrogenous matter supplies the used-up muscles, and 
allows work to be done, aiding also in the production of 
heat. The fats and carbohydrates maintain the heat of 
the body and supply the used up-fats and carbonaceous 
matters to the tissues. The salts which are found com- 
bined in all animal and vegetable tissues play a very 
important part in the maintenance of health. Even if the 
small proportion of iron in the human body is not main- 
tained, disease and ill-health result. In good beef no 
less than 7 grains of salts are found in every ounce and 
in 100 parts of the ash of beef the following are found : — 
Potash 
Magnesia ... 
Lime 
Potassium 
Chlorine ... 
Oxide of Iron 
Phosphoric Acid 
Sulphuric Acid 
Silica 
Carbonic Acid 
In milk there are found the following : — 
Potash 
35'94 
3'3i 
1*73 
5'34 
4-86 
•98 
34*36 
3'37 
2*07 
8*02 
23-46 
