Ossein, [218].

Overstudy, [211].

Oxidation, defined, [106].

Oxygen, [104]-[117].
Combined, [105], [113].
Free, [105], [113].
How it unites, [105].
Main uses of, [108].
Movement a necessity, [106], [108], [115].
Movement in body, [106], [108], [115].
Nature of, [104].
Passage of, from cells, [110].
Passage of, through blood, [109].
Passage of, toward cells, [109].
Preparation of, [113].
Pressure, [109].
Properties of, [113].
Purpose of, in the body, [106].

Oxyhemoglobin, [27].

Pacinian corpuscles, [342], [343].
To demonstrate, [348].

Pancreas, [155].

Pancreatic juice, [155].

Papillæ, [266].

Patent medicines, [166].