

The authors are thankful for the gratuitous well designed program by John Lewkowicz, of the Veterinary Computing Service at Cornell University, and for the wonderful editing, proof reading and typing by Dr. Linda Parrish, Madison Area Technical College, Reedsburg, WI, and Dr. James O.Britt, Livestock & Poultry Commissions Lab, Little Rock, AR.



We are indebted to Ms. Susan Williams, Cornell University, for the uploading of most of the pictures, and also we thank Ms. Ashley Olson for the remainder.



Financial help was given primarily by the NYS College of Veterinary Medicine, Cornell University, and a grant from the Albert E. Podell Emeriti Awards for Research and Scholarship, in the Cornell Association of Professors Emeriti (CAPE), to allow the project to be concluded successfully.



We hope that the identified sources when known, and included with each picture and text, will give credit to all those who contributed to this effort and are thanked, sincerely thereby.

