ILLUSTRATIONS 



Plate 1 



1. Camera lucida sketch showing treponemata in oedematous 



nective tissue about vessel in a papilla. 



2. Leucocytic infiltration of epithelium in an early yaw be 



3. Focus of leucocytes in epithelium and treponemata. 



Plate 2 



. 1. Early yaw in case 2 before treatment. Same i 



2. Yaw from case 2 three days after injection of neosalvarsan, snow- 



ing scab, disappearance of exudate, and increased compactness 

 of epithelium. 



3. Yaw from case 2 nine days after injection of neosalvarsan, show- 



ing hyperkeratosis and thinning of epithelial layer. 



4. Early yaw from case 1 before treatment. Leucocytic 



and swelling of epithelial layer. 



5. Yaw from case 1 forty hours after injectioi 



Exudate disappearing, epithelial layer more compact and thinne 



6. Necrosis of polymorphonuclear leucocytes about vessels in tt 



epidermis forty hours after injection of neosalvarsan. 



7. Same as fig. 6, showing necrosis and phagocytosis of leucocytes. 



