218 DESCRIPTION OF PLATES 



PLATE XXI 



FIGURE 51. Cerebellum. Autopsy 16, death on fourteenth day. A com- 

 pact proliferative lesion showing relation to a capillary. Compare with 

 drawing, Plate XXIII, figure 56. Approximately 500 diameters. 



FIGURE 52* Compact proliferative lesion in central cortex. Autopsy 21, 

 death on fourteenth day. See low power photomicrograph, Plate XIX, 

 figure 48 and drawing, Plate XXV, figure 60. Approximately 350 

 diameters. 



PLATE XXII 



FIGURE 53. An early cerebral lesion in guinea-pig 19 ten days after inocu- 

 lation with viscera of louse 238. See protocol, page 56. The drawing 

 shows thrombosis, proliferation of endothelium, and phagocytosis, and 

 early reaction of the peri vascular neuroglia. Note the polymorphonu- 

 clear leucocytes. Approximately 1,000 diameters. 



FIGURE 54. An early proliferative lesion of the compact type in the super- 

 ficial layer of the cerebral cortex. Human. Autopsy 29, death on 

 fourteenth day. A mitotic figure, probably of the endothelium, is 

 present. The lesion is situated at the branching of a precapillary which 

 shows proliferation and discontinuity of the endothelium. 550 diameters. 



PLATE XXIII 



FIGURE 55. A loose textured proliferative lesion in the superficial layer of 

 the cerebral cortex. The cells are almost exclusively neuroglia cells. 

 Rod cells and cells with sausage-shaped nuclei are in the adjacent 

 tissue. Zeiss 4 mm. apo. 4 comp. ocular. 400 diameters. 



FIGURE 56. A proliferative lesion of the compact type in the molecular 

 layer of the cerebellum, showing relation to a capillary. Autopsy 16, 

 death on fourteenth day. Compare with photomicrograph, Plate XXI, 

 figure 52. 400 diameters. 



PLATE XXIV 



FIGURE 57. A small hemorrhage in the superficial layer of the cerebral 

 cortex. Autopsy 8, death on seventh day. The red blood cells have been 

 taken up by macrophages (endothelial leucocytes). The other cells 

 are possibly of neuroglia origin. A rod (Stabchen) cell is shown on the 

 right. 600 diameters. 



