viii PREFACE 



contributed data on the clinical symptoms of the question- 

 able or uncommon forms of mastitis. 



To all colleagues who have assisted me in my work 

 through material submitted or written information I ex- 

 tend my heartiest thanks. Finally I wish to express my 

 deepest gratitude to my highly esteemed teacher, Professor 

 J. Svensson, who has placed cows at my disposal and guided 

 me in the technic of the bacteriological and pathologic- 

 histological investigations. 



SVEN WALLi, 



Stockholm. 



