INTRODUCTION". 29 



Protectives are substances applied to cover or 

 protect an injured or inflamed part to exclude air, 

 dust, water and to prevent friction. 



Agents Acting on Microbes, Parasites, etc. 



Antizymotics, agents which prevent and check all 

 organic fermentative processes, also those dependent 

 upon organized ferments (bacteria, cocci, etc.) . They 

 are divided into two groups, viz. : 



Antiseptics, which destroy the bacilli which cause 

 septic decomposition — as mercuric chloride, hydrogen 

 dioxide, formalin, mercurous chloride, hydronaph- 

 thol, sulphurous acid, quinine, thymol, carbolic acid, 

 alcohol, and many others. 



Disinfectants are agents which destroy the germ^ 

 of infectious diseases. Some of these are oxidizanc? 

 —lime, chlorine, iodine; some are desulphurants— 

 as sulphate of iron; absorbents— as charcoal; de- 

 odorants—as ozone, lime, chlorine, and sulphurous 

 acid gases, which destroy the bad odors while also 

 disinfecting. 



Parasiticides are agents which destroy animal 

 and vegetable parasites living upon the body. They 

 are applied usually as lotions and ointments and con- 

 tain sulphur, iodine, mercury and its chlorides, car- 

 bolic acid, preparations of tar, etc. 



Agents Acting upon Each Other. 



Antidotes are agents v;hich act upon poisons in 

 such n m^^ner '^s tr pre^enc them from exerting their 



