DIGESTION OF FOOD. 293 
They also seem to stimulate the flow of healthy digestive fluids. 
Condiments act chiefly, perhaps, in the latter way. Tea, coffee, 
etc., contain alkaloids, which it is likely have a conservative 
effect on tissue waste, but we really know very little as to how 
it is that they prove so beneficial. Though they are recognized 
to have a powerful effect on the nervous system as stimulants, 
nevertheless it would be erroneous to suppose that their action 
was confined to this alone. 
Animal Foods. 
ene of the signs. 
Water. 
Beef. { . 
Pork. [_ 5 [=e 
Fowl. | 73 a We 
Fin [ 76 = 7] 
Eg. | 73.5 
Cow's mitk. [| 86 
Human mak. | 9 PATA] «+ 
Vegetable Foods. 
Explanation of the lens. 
Water, Protetds D i Non-d i Salts, 
Wheaten-bread. | 
Peas. 
Rice. = 
Potatoes. | 75 1. 1 
White Turnip. | 90.5 il : il} 0.5 
Cawiflower. | 90 | 
me, | 90 
Fie. 248 (Landois). 
The accompanying diagrams will serve to represent. to the 
eye the relative proportions of the food-essentials in various 
kinds of articles of diet. : 
