Alimentary canal, [169], [170]
Amoebic dysentery, how prevented, [122];
how spread, [122];
where prevalent, [122]
Animals free from typhoid fever, [113]
Antitoxin, how it acts, [108–110];
how discovered, [109];
sometimes considered a poison, [111];
prevents diphtheria, [110];
saves lives, [110]
Aqueous humor, [177]
Arterial blood, [172]
Arteries, [171]
Articles used by the sick, dangers from, [75];
how to treat, [76]