TRANSLATOR'S PREFACE v 



tion, which is a reaction of the body to the action of an irri- 

 tant, or an attempt on the part of the body to repair an 

 injury. 



Thus the inflammation or mastitis, by the various factors 

 pertaining to it, i.e., (1) alteration of tissue (primary 

 lesion, degeneration, desquamation, necrosis ) , ( 2 ) emigra- 

 tion of leucocytes (fluid and cellular exudates, phagocy- 

 tosis), or (3) proliferation of connective tissue (repair by 

 healing, false regeneration), is hut the eocpression of the 

 presence of the fundamentally interesting udder-wound, or 

 udder-infection, he it stroma-infection or milk-infection. 



The foregoing co-ordination of terms used by Professor 

 Wall with those most familiar to our literature precludes 

 the possibility of failure on the part of the early student 

 of pathology to grasp the complete significance and full 

 appreciation of Professor Wall's treatise on the udder- 

 inflammations of the cow. 



By the use of [ ] I have endeavored to include such 

 available data as tend toward a closer application to con- 

 ditions prevailing in tliis country, and at this time. 



Walter J. Crocker. 



Philabelphia, Pa., 

 January, 1918. 



