ILLUSTRATIONS 



XV 



Fig. 27. Graph showing the transmission of hght of various 



wave-lengths through toluidine blue solution page 250 



Fig. 28 (coloured plate), a, human blood from a patient 

 with myeloid leucaemia; coloured by Ehrlich's 

 'Triacid' dye (from Ehrlich & Lazarus^^^) 



B, normal human blood dyed by Leishman's 

 method (from Carleton & Short, ^^^ by permission 

 of Messrs Longmans, Green & Co.) facing page 264 



Fig. 29 (plate). Ehrlich at about the time when his work on 



vital dyes was merging into chemotherapy 274 



