1^0 The Lymphocyte and Lymphocytic Tissue 



is not unlike that of cells which I shall illustrate later. To this day there is 

 no general agreement as to what a Turk cell is, 15 and, since Turk's own 

 description was hardly definitive enough to justify the eponym, we must 

 blame his successors for establishing this term firmly in the literature and 

 in laboratory slang. 



Fig. 11-2. Infectious mononucleosis, peripheral blood. Wright's stain. (X 1700) 



Infectious Mononucleosis 



The paper of Evans and Sprtint. 7 established the term "infectious mono- 

 nucleosis" for the acute illness characterized by abnormal lymphocytes in 

 the peripheral blood. Three years later Downey and McKinlay 5 provided 

 the classic description of atypical lymphocytes of infectious mononucleosis, 

 classified these cells into three types, and thus became responsible for the 

 concept that the atypical lymphocyte of infectious mononucleosis is so char- 

 acteristic as to justify the term "infectious mononucleosis cell." It was only 

 one small step from this to the concept that these cells in the peripheral 



