﻿14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 



EXPLANATION OF PLATES 



Plate i 



Fig. 1. Bacillus of typhoid fever. A common rod-shaped bacterial type. 

 Fig. 2. Pneumococcus, the cause of acute pneumonia, mingled with white 

 blood corpuscles (phagocytes). From an infected mouse. 



Plate 2 



Fig. 1. Meningococcus, the cause of epidemic cerebrospinal meningitis. It is 

 characteristic of this coccus to be within the white corpuscles or phagocytes. 

 Fig. 2. Spirocheta of African tick fever. In the blood of an infected mouse. 



Plate 3 



Fig. 1. Ticks that carry and inoculate the spiral microorganism of African 

 tick fever. 



Fig. 2. Tsetse fly that carries and inoculates the trypanosome of sleeping 

 sickness. 



Plate 4 



Fig. 1. Trypanosomes. A protozoal parasite causing diseases of animals 

 and the sleeping sickness of man in the tropics. 



Fig. 2. Spirocheta pallida in artificial culture. The microorganismal cause 

 of syphilis. 



Plate 5 



Fig. i. Spirocheta pallida in the liver of a new-born infant (diagram- 

 matic). The intimate association of parasites and tissue cells is shown. It is 

 the purpose of a specific curative substance to destroy the former without in- 

 juring the latter. 



Fig. 2. Chart prepared by Dr. Dunn, of Boston, to show the effect of the 

 antimeningitis serum on the mortality from epidemic meningitis in the Chil- 

 dren's Hospital, Boston. The serum treatment was introduced in 1906 at 

 the point indicated by the cross (X). 



