240 INFECTIOUS AND PARASITIC DISEASES. 



spread in a thin layer between them, when they are at 

 once separated by gently drawing one over the other 

 in the same plane, i.e., parallel to the other. 



If an examination of the red and white 



Specimen FOR elements of the blood is to be made, blood 



oRPuscuLAR ^^^^ ^^^ prepared upon slides or cover- 



EXAMINA- , .1 1 -1 1 f 



glasses m the same way as described for 



TION. 



malaria. 



Fig. 31. — Cover-glass is touched to summit of a drop of blood and 

 then allowed to fall on a second cover-glass, margins overlapping. 

 Method of separating cover-glasses. (Clinical Diagnosis, Boston.) 



The microscopical examination of purulent 

 Pus AND or other discharges often permits of the 

 OTHER immediate discovery of the agents causing 



Discharges, a disease, a fact which may be of incalcul- 

 able benefit to the patient, and a sure guide 

 for the doctor. This is the case, for example, in puru- 

 lent ophthalmia, a suppurative conjunctivitis most fre- 

 quently observed in the new-born, although also found 



