TRANSLATOR'S PREFACE 



The dearth of detailed scientific and practical literature 

 on the subject of inflammation of the udder in cows 

 prompted me to prepare a translation of Professor Sven 

 Wall's excellent book, " Die Euterentzundungen der Kuh." 



Not only is the subject adequately treated in all its im- 

 portant practical relationships, but the conclusions drawn 

 have been established upon sound principles of pathology 

 and by decisive animal experimentation. The tubulo-alveo- 

 lar system. Professor Wall observes, is lined by epithelium, 

 cubical and flat, which constitutes the 'parenchymatous tis- 

 sue. This is supported by interstitial connective tissue 

 which constitutes the stroma. 



Bacterial invasion of the interstitial connective tissue 

 comprises a stroma-infection, the presence of which is mani- 

 fested, more or less obviously, by a reaction on the part of 

 the body to the bacterial irritation called an inflammation 

 or inter stitiaVmastitis. This may be primary or secondary 

 depending upon the manner of its inception, or acute or 

 chronic depending upon its duration and the character of 

 the specific etiological factors. 



Bacterial invasion of the tubulo-alveolar system or 

 parenchymatous passages, and thus necessarily the milk 

 which is contained in them, he calls a parenchyma-infection 

 or milk-infection, the presence of which is manifested by a 

 reaction on the part of the body to the bacterial irritation 

 called an inflammation or parenchymatous mastitis. This 

 may be primary or secondary depending upon the manner 

 of inception, or acute or chronic depending upon its dura- 

 tion, — and based upon the character of its inflammatory 

 exudate it is classified as catarrhal mastitis, sero-hemor- 



