116 



PRINCIPLES OF BACTERIOLOGY 



Essential oils : Cardeac and Meumir found that the essences of cin- 

 namon, cloves, thyme, and others killed typhoid bacilli within one 

 hour. Sandalwood required twelve hours. 



Thymol and eucalyptol have about one-fourth the strength of car- 

 bolic acid (Behring). 



Oil of peppermint in 1 : 100 solution prevents the growth of bacteria. 



TABLE OF ANTISEPTIC VALUES. 1 



Mercuric chloride 

 Mercuric iodide . 

 Potassium bromide . 

 Potassium iodide 

 Potassium permanganate 

 Pure formaldehyde . 

 Quinine sulphate 

 Silver nitrate . 

 Sodium borate . ' . 

 Sodium chloride 

 Zinc chloride 

 Zinc sulphate 



14,300 



40,000 



10 



10 



300 



25,000 



800 



12,500 



14 



6 



500 



20 



1 These figures are approximately correct, and represent the percentage of disinfectant required 

 to be added to a fluid containing considerable organic material, in order to permanently inhibit any 

 bacterial growth . 



