Page. 



Bacterial Diseases of the Rat other than Plague (Donald H. Currie) 55 



Danysz bacillua or bacillus typhi Murium of Loeffler 55 



Pneumonia 56 



Staphylococcus abscesses 56 



Bacillua pseudo-tuberculosis rodentium (Pfeiffer) 57 



Toyama's bacillus 57 



Infections of mice 57 



Organic Diseases of the Rat, Including Tumors (George W. McCoy) 59 



Usefulness of wild rats for laboratory purposes 59 



Circulatory apparatus 60 



Pulmonary apparatus 60 



Digestive tract 61 



Cirrhosis of the liver 61 



Fatty degeneration of the liver 61 



Hernia 61 



Genito-urinary tract 62 



Nephritis 62 



Abscess of the kidney 62 



Atrophy of the kidney 63 



Vesical calculi 63 



Tumors 64 



Metastases 67 



Histological structure 67 



Lipomata 67 



Fibromata 67 



Sarcomata 67 



Adenomata and Carcinomata 67 



Ectoparasites of the Rat (Nathan Banks) 69 



Fleas — Siphonaptera 69 



Lice — Anoplura 77 



Mites — Acarina 80 



Internal Parasites of Rats and Mice in Their Relation to Diseases of Man (Ch. 



Wardell Stiles and Charles G. Crane) 87 



Summary 87 



Introduction 87 



Protozoa 88 



Cestoda 95 



Nematoda 101 



Acanthocephala 108 



Compendium of Animal Parasites Reported for Rats and Mice — {Genus Mus) 



(Ch. Wardell Stiles and Albert Hassall) Ill 



The Flea and Its Relation to Plague (Cairoll Fox) 123 



Theories as to the transmission of plague 123 



Insects that have been suspected in the transmission of plague 124 



Experiments proving that fleas can transmit plague 125 



The bacillus in the flea 126 



How the flea clears itself of bacilli 127 



Regional distribution of fleas on rats 127 



Anatomy of the mouth parts of the Ceratophyllus Fasciatus 128 



Outside the head 128 



Inside the head 129 



The act of biting 131 



How the flea infects its host 132 



Enumeration of fleas that have been found on rats 133 



