Acknowledgments 
The encouragement of Dr. Eugene Dustman, Director of the Patuxent 
Wildlife Research Center is appreciated. Gratitude goes to Mr. Milton 
Schechter and Dr. Phillip Kearney of the United States Department of 
Agriculture and Dr. Walter Benson of the Food and Drug Administration, 
who took time to read portions of this manuscript and to offer comments. 
The editorial staff of the Patuxent Wildlife Research Center and of the 
Bureau of Sport Fisheries and Wildlife provided editorial advice and 
critical readings. To Mrs. Edythe Bascomb and Mrs. Nancy Coon is 
owed my special gratitude for assistance in the extensive library work 
and typing that produced this manuscript. 
