viii PREFACE 



attendant undergoes a harassing time, his reputation is 

 at stake, and he may perchance lose a lucrative client. 

 The veterinary surgeon is in a much happier position, he 

 does not require to consult his patient, study his whims, 

 or pander to his capricious fancies, or have his reputation 

 held up to ransom if all does not go quite well with the 

 feelings of his patient or the doubtful desires of his client. 

 If he has gained the confidence of his client, he can treat 

 his patient in whatever manner he chooses; all that is 

 required is a restoration of his animal to good health. If, 

 therefore, vaccine therapy is scientifically sound — and who 

 will deny this ? — if its results warrant its application in 

 tilling a gap no other course of therapeutical treatment 

 can, it behoves the practitioner in his clients' interest and 

 his patients' welfare to take up the treatment, not half- 

 heartedly, which will never lead to success, but giving it 

 wholly and fully his serious consideration, rig-idly taking 

 note of every detail, and benefiting from the teachings 

 of each individual case. In the whole field of veterinary 

 science I know of no subject which possesses such oppor- 

 tunities for research and carries with it such active and 

 varied interests than vaccine therapy. Every practitioner 

 can be an immunizer, and to show him that he can, with 

 a little diligent effort on his own part, was the primary 

 object I had in view in writing this little book. I am fully 

 alive to the many imperfections it contains, and I know in 

 abler hands there is scope for a much better work. The 

 great portion of this book was written in the small hours 

 of the morning, often after a busy and exacting day, and 

 to those who know the responsibilities and disturbing 

 influences of a busy practice, which are by no means con- 

 ducive to successful literary effort, not to say mental 

 concentration, I am sure I shall not appeal for their 

 indulgence in vain. I have endeavoured to introduce as 

 little debatable matter as possible in order that the reader 

 may not have to wade through unnecessary detail. 



"When further information on bacteriology and a fuller 



