NOTES ON SOME TROPICAL DISEASES 



33 



FIG. 8. LEISHMANNIA DONOVANI : THE PARASITES OF BLACK-FEVER AND 

 TROPICAL SPLENOMEGALY. (After L. Rogers ; selected from the British 

 Medical Journal?} 



i, A leucocyte containing four parasites as seen when freshly taken from the 

 spleen of a living subject ; 2, a similar leucocyte after being kept in cooled 

 citrated blood : the parasites have grown, and one is in course of subdivision ; 

 3, other examples of the parasites as found within the human host ; 4, three 

 parasites undergoing growth and subdivision : this and the rest were grown 

 under the same conditions as 2 ; 5, 6, and 7, a later stage : development of 

 flagella and subdivision ; 8, an incomplete rosette formed, by repeated longi- 

 tudinal subdivision; 9, 10, and n, parasites that have detached themselves 

 from groups such as 8, and are freely moving; 12 and 13, involution-forms, 

 caused by growth of staphylococci in the culture medium. 



