PREFACE 



THE present volume is a revision of the lectures on veterinary 

 bacteriology given during the past six years to classes in the Division 

 of Veterinary Medicine in the Iowa State College. It constitutes 

 a serious attempt to put in usable form that fund of knowledge 

 concerning bacteriology which the student of veterinary medicine 

 should master. It is in no sense a text on pathology, and discus- 

 sion of purely pathological subjects has been minimized as much as 

 possible. The intention has been to confine attention as far as 

 practicable to those topics that unquestionably lie in the province 

 of bacteriology. This has been defined to include a discussion 

 of immunity and of the pathogenic bacteria, yeasts, molds, and 

 protozoa. 



The book is not intended to serve as a manual of laboratory 

 practice, hence detailed discussion of methods and technic has 

 been omitted. Methods of significance in diagnosis or treatment 

 are given in greater detail in the discussion of specific organisms. 



Several organisms causing diseases of man not transmissible 

 to lower animals have been included. In all cases they are closely 

 related to organisms having significance to the veterinarian, they 

 cause diseases which are commonly confused with somewhat similar 

 diseases of lower animals, or they are valuable as illustrations 

 of methods of immunization, treatment, or diagnosis. Such 

 organisms are relatively few in number. 



A group system of discussion of the pathogenic bacteria has 

 been adopted. The classification used has proved very helpful in 

 my own classwork. The groupings used are not entirely satis- 

 factory, in part due to the fact that some of the species have not 

 been adequately described and differentiated in the literature. 

 An effort has been made to point out the deficiencies in our present 

 knowledge, both to give a better balanced presentation of the sub- 

 ject and to stimulate interest in the solution of the problems. 



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