PREFACE vii 



but also from the cost of feeding and keeping them. 

 On this account our experiments, though covering 

 a fairly wide field, have not been so numerous in some 

 cases as we should have wished. In view of the impor- 

 tance of this disease to agriculturists, the question is 

 one which should be investigated with public money. 

 In our work on this disease, however, we have re- 

 ceived no assistance from the Board of Agriculture or 

 from the Development Fund Commissioners, even 

 though applications for a grant have been made after 

 the essential part of our work — the cultivation of the 

 bacillus — had been verified by the Danish Government 

 veterinary bacteriologists. Under these circum- 

 stances, we wish to give especial notice to the 

 generosity and kindness of many owners and breeders 

 of cattle who have assisted our work with gifts of 

 affected animals for experimental purposes, to the 

 help aff'orded by a large number of veterinary surgeons 

 who have sent specimens and answered questions on 

 diff'erent points of interest, to the Royal Society for 

 the monetary grants which made the earlier experi- 

 ments possible, and to the University of London for 

 the grants from the ** Henry Dixon" Fund for research. 

 We wish to thank Professor Dr. Miessner of Hanover, 

 Dr. Halfdan Holth of Copenhagen, and Professor 

 Penberthy for the loan of papers and for references to 

 other authors. Monsieur Vukovic of Livno (Bosnia) for 

 sending a paraffin block and details of his own work 

 on the disease as it aff'ects sheep, and Messrs. De Vine, 

 Hamilton, Angwin Le Sueur, and other veterinary 

 surgeons for kind assistance in many directions. 



F. W. T. 



G. L. Y. I. 



April, 1913. 



