412 



Diphtheria 



Fig. ISO. — Bacillus diphtherise, five hours 

 at 36° C. This shows only solid staining 

 forms. 



M 





Fig. 1S2. — Bacillus diphtherise, same cul- 

 ture, twelve hours at 36° C. The bacilli 

 stain faintly at their ends, and in some small 

 granules are seen at the tip of the faintly 

 stained portions. 





i 





Fig. iS4 — Bacillus diphtheriae, same cul- 

 ture, twenty-four hours at 36° C. This 

 shows clubbed and barred forms as well as 

 granular forms. At the lower part of the 

 field is a paired form which shows the char- 

 acteristic clubbing of the distal ends. 



(Photomicrographs by Mr. Louis Brown. 



Fig. iSi. — Bacillus diphtheriae, same cul- 

 ture, eight hours at 36° C. This also shows 

 solid forms, many of them with parallel ar- 

 rangement. 



Fig- IS3* — Bacillus diphtheriae, same cul- 

 ture, fifteen hours at 36° C. The bacilli 

 stain more unevenly and the granules are 

 larger. 



Fig. iSS. — Bacillus diphtherije, forty- 

 eight hours at 36° C. This is the same 

 bacillus as in the preceding figures, but from 

 a culture where the colonies were discrete. 

 It shows long filamentous forms. 



The magnification is the same in all — X 2000. 

 All of the preparations were made from growth on blood-serum.) (Francis P. Denny, in 

 " Jour, of Med. Research.") 



