22 PRINCIPLES OP VETEEINAET SXTBGEBY 



common staphylococcus pyogenes albus; 3, staphylococcus :; 

 pyogenes citrius; 4, streptococcus pyogenes; this and the first 

 one are the most important ones; it is especially concerned in 

 the production of progressive phlegmonous suppurations. 



What is pus P 



The material which forms as the result of suppurative 

 inflammation. 

 Describe healthy and laudable pus 9 



It is represented by a yellowish-white odorless alkaline 

 thick creamy liquid which does not coagulate. 



What is ichorous pus ? 



Pus which has undergone decomposition produced by the 

 presence of micro-organisms of putrefaction. 



What is sanious pus ? 



It is pus undergoing decomposition plus blood. 



By tvhat is the quantity and quality of pus influenced ? 



It depends on the consistency and vascularity of the tis- 

 sues, the size and age of the wound, the kind and number of 

 pus cocci, the time of the year, temperature, climate and 

 species of animal. 



Describe the constituents of pus. 



When pus is allowed to stand in a vessel, two layers can 

 be seen. 



The upper one is thin and slightly yellowish, and is 

 termed pus serum (Liquor puris). It contains an albuminous 

 substance called peptone and salts in about the same propor- 

 tion as the blood. 



The second layer or sediment is composed of pyogenic 

 cocci, possibly other bacteria, tissue shreds and pus cor- 

 puscles, red blood cells, droplets of fat. 



