718 LAURA FLORENCE 
Husbandry of the same College for the loan of the hog; to Professor E. S. 
Savage, of the Department of Animal Husbandry at Cornell University, 
and to Drs. Carl Ten Broeck and R. B. Little, both of the Department 
of Animal Pathology at the Rockefeller Institute for Medical Research, 
for assistance in obtaining lice; to Dr. W. A. Riley, of the University of 
Minnesota, for a supply of man-infesting lice for comparative purposes; 
to Dr. 8S. A. Goldberg, of the New York State Veterinary College, for 
assistance in taking photographs; and to Professor Ulric Dahlgren, of 
Princeton University, for access to the library of the Department of 
Biology at that institution and to the piggeries of the university farms. 
The illustrations were drawn by Miss Ellen Edmonson, to whom we 
are deeply indebted for the great care with which she has done the work. 
