136 PATHOGENIC BACTERIA. 
FIG. 70. Fie. 71. 
Fic. 70.—Providence Health Department outfit for diph- 
theria diagnosis. A pasteboard box containing a swab- 
tube and a serum-tube, both with etched surface on which 
to write the name and address of patients, etc. 
Fic. 71.—Bacterium diphtheriz; agar culture (photo- 
graph by Dr. Henry Koplik). 
swab made of non-absorbent cotton over the back 
of the throat, tonsils, diphtheritic membrane, ete. 
2. Rub the swab over the surface of a Loffler 
blood-serum tube. 
