SECRETIONS AND EXCRETIONS. 



241 



In making 

 of 



in adults, and which if not recognized speedily leads 

 to permanent blindness. Specimens of such discharges 

 are collected upon slides 

 or cover-glasses in the 

 same way as described for 

 malaria, care being exer- 

 cised that the smears are 

 not too thick, 

 smears in this class 

 cases, it is safest, on ac- 

 count of the danger of 

 self-infection, to use an 



object easily destroyed, as Fig. 32.— Intra-ceUular (a) and (b., c.) 

 for example a tooth-pick, extra^cellular gonococd. (Casper.) 



which is then burned. 



No secretion during sickness is subject to 

 Urine. closer scrutiny than the urine. It is the 



chief avenue for the elimination of nitro- 

 gen from the body, as well as for other substances which, 

 if retained, are distinctly harmful. In many diseases it 

 is the channel of exit for the specific bacteria from the 

 body. Such highly significant data bearing upon a pa- 

 tient's illness are obtained from a study of the urine, 

 that the precise condition of this secretion is always as- 

 certained. 



Normal urine, when freshly voided, should 

 Color. be perfectly clear or faintly cloudy. Its 



color is variable, verging from a light yellow 

 16 



