DESCRIPTION OF PLATES 217 



PLATE XVII 



FIGURE 43. Myocardium. Autopsy 9, death on ninth day. Shows infil- 

 trations between muscle fibers and a minute necrosis of the muscle. 

 825 diameters. 



FIGURE 44. Adrenal gland cortex showing a type of lesions common in 

 many infectious diseases as well as typhus. Autopsy 1, death on tenth 

 day. 825 diameters. 



PLATE XVIII 



vFiGURES 45 and 46. Photomicrographs of the Ammon's horn and cerebral 

 cortex respectively of guinea-pig 219, a passage virus animal (see chart 

 2). This guinea-pig became paralyzed the day following its return 

 to normal temperature, which was seventeen days after the inoculation. 

 The figures illustrate the size and distribution of the proliferative lesions 

 in guinea-pigs. Approximately 100 diameters. 



PLATE XIX 



FIGURE 47. A higher power photomicrograph of one of the lesions shown 

 in Plate XVIII, figure 46, guinea-pig 219. A central capillary is shown. 

 Polymorphonuclear leucocytes are present although the stage of the 

 disease was late and the temperature normal. Approximately 500 

 diameters. 



FIGURE 48. Cerebral cortex. Autopsy 21, death on fifteenth day. To 

 show two compact proliferative lesions and perivascular infiltration. 

 See high power photomicrograph, Plate XXI, figure 52, and drawing 

 Plate XXV, figure 60, for details of compact lesion in lower left quad- 

 rant. Approximately 100 diameters. 



PLATE XX 



FIGURE 49. Olivary nucleus, medulla. Autopsy 20, death on twentieth 

 day. Two compact proliferative lesions in one 16 mm. objective field. 

 Approximately 150 diameters. 



FIGURE 50. Higher power photomicrograph of one of the lesions in Figure 

 49. The peripheral condensation of cells, neuroglia, is a feature of late 

 lesions. Approximately 600 diameters. 



