102 Manual of Veterinary Microbiology. 



3. Strong antiseptics : 1 to 5 grams. 

 (Bichromate of potassium, chloroform, chloride 



of zinc, carbolic acid, permanganate of potas- 

 sium, alum, tannin.) 



4. Moderate antiseptics : 5 to 20 grams. 

 (Arsenious acid, boric acid, chloral hydrate, 



salicylate of sodium, sulphate of iron.) 



5. Weak antiseptics : 20 to 100 grams. 

 (Borate of sodium, alcobol.) 



6. Very weak antiseptics : 100 to 300 grams. 

 (Arseniate of potassium, iodide of potassium, 



sea salt, glycerin.) 



CHAPTER IV. 



METHODS OF DETERMINATION OF PATHOGENIC MICROBES. 



1. Examination, investigation, and staining of bacteria. — 2. Cult- 

 ure of bacteria. — 3. Experimental inoculations. 



We have now, in order to finish the general study 

 of pathogenic germs, to review the different methods 

 of determination of these germs, that is, the means 

 which we have of distinguishingthem from each other, 

 or recognizing them. This means consists in, 1st, mi- 

 croscopical examination of the bacteria either directly 

 or after coloring them; 2d, their culture in artificial 

 media; and, 3d, the test of the effects which they de- 

 termine in animals. 



lu practice, and for certain germs which are well 



