ACKNOWLEDGMENTS 



The authors wish to express their appreciation to Professor 

 W. C. Skoglund, Head of the Department of Poultry Husbandry 

 at the University of Xew Hampshire, for his guidance in the re- 

 search program and the preparation of this liulletin. 



We are also grateful to Mr. Robert E. Leventhal, Graduate 

 Research Assistant in Poultry, and to Mr. Donald E. Coller, 

 Senior Laboratory Technician, both of the Poultry Department. 

 University of New Hampshire. 



Thanks also are extendetl to the many poultrymen in New 

 Hampshire who cooperated in this study. The Poultry Disease 

 Research Committee of the New Hampshire Poultry Growers 

 Association was instrumental in organizing the poultrymen. With- 

 out their financial help and willingness to provide experimental 

 flocks this study would not have been possil)le. 



Acknowledgement is also made to the Lederle Laboratories 

 Division of the American Cyanamid Co. for providing a research 

 grant to make part of this study possible. 



In addition, thanks are also extended to the following poultry 

 students at the University who did the actual spra}'ing in the field : 

 Edwin Antz, Harold Albin, Charles Avery, Andrew Brochu, John 

 Dodge, Fred Jennings, Roger Laber, Jerald Uuimby, and Dean 

 Towle. 



COVER: One method of mass immunization by spray. 



JANUARY 1955 



