EXPLANATION OF FIGURES IN PLATE IV. (After Mallory.) 



The drawings wore made with the Abbe camera lucida; projection on to table. 

 Zeiss apochromatic homogeneous immersion 2.0 mm., apert. 130, compensation 

 ocular 6. 



FIGS. 1 and 2 show numerous large and small scarlet fever bodies (stained light 

 blue) in and between the epithelial cells of the rete mueosum. In Fig. 1 is a 

 large body in a lymph space of the curium just underneath the epidermis. 

 Several of the bodies suggest fixation while in amceboid motion. 



FIGS. 3, "), and G are coarsely reticulated forms which may he degenerated 

 forms of the scarlet fever bodies, or stages in sporogony. 



Fins. 4, S, and 9 probably represent stages preceding the radiate bodies. In 

 Fig. I he bodies lie in a lymph space. It shows also four small forms which 

 have just got free from a rosette. 



FIGS. 7, 10, 11, 12, 13, 14, and 1~> show different stages in the development of 

 the radiate bodies. 



Fig. 10 is the earliest stage: there is a distinct central body and a definite, 

 regular arrangement of granules at the periphery. Figs. 7, 11, and 12 show a 

 little later stage of development; 11 and 12 are optical sections, while 7 is a 

 surface view. Moreover, in Fig. 7 the body lies free in a lymph space in the 

 curium. The segments begin to show a certain amount of lateral separation 

 from each other. Fig. 13 is a still later stage: the segments are increasing in 

 size and are more or less free from each other, although most of them arc still 

 attached to the central body. In Fig. 14 the segments are all free and enlarging, 

 although still grouped around the central body. In Fig. 15 the bodies are still 

 grouped around the central body, which is free and stains deeply with eosin. 



