are the principal carriers
of the disease.

HERZOG, MAX. The Plague, Bacteriology, Morbid Anatomy &
Histopathology, Including the Consideration of Insects as Plague
Carriers. Biological Laboratory Bureau of Govt. Laboratories,
Manila, Oct., 1904. Reviews the evidence regarding the possibility
of fleas carrying plague; describes a new rat flea (_Pulex
philippinensis_); records experiments with fleas and cites a case
of bubonic plague in a child in which the infection was possibly
carried by _Pediculi_.

MCCOY, G.W. Plague Bacilli in Ectoparasites of Squirrels. _Pub.
Health Reports, Pub. Health and Mar. Hospt. Ser._, Vol. XXIV, No.
16, Apr. 16, 1909. Experiments with fleas and lice from infected
squirrels demonstrating presence of plague bacilli.

MCCOY, G.W. The Susceptibility of Gophers, Field-mice and
Ground-squirrels to Plague Infection. _Jour. of Infec. Diseases_,
Vol. 6, 1909, No. 3, pp. 283-288. Gophers highly resistant,
field-mice moderately susceptible and ground-squirrels very
susceptible to plague.

MITZMAIN, M.B. Insect Transmission of Bubonic Plague: a Study of
the San Francisco Epidemic. _Ento. News_, 19, No. 8, 1908, pp.
353-359. Fleas obtained in examination of 1,800 rats. Attempt to
locate source of rat and flea introduction.

MORTON, F.M. Eradicating Plague from San Francisco. Report of the
Citizens' Health Com. and an account of its work. San Francisco,
1909. Discusses the epidemics, methods of transmission, methods of
fighting, etc.

RUCKER, W.C. Plague Among Ground-squirrels in Contra Costa Co.,
Cal. _Pub. Health Reports, Pub. Health and Mar. Hospt. Ser._, Aug.
27, 1909. Reports of human cases supposed to be connected with
plague among ground-squirrels. Plague among squirrels; habits,
methods of fighting, etc.

RUCKER, W.C. Fighting an Unseen Foe. _Sunset Mag._, XXII, No. 2,
Feb., 1909. Story of the fight against plague in San Francisco.

SHIPLEY, A.E. Rats and Their Animal Parasites. _Jour. Eco.
Biology_, Vol. III, No. 3, Oct. 28, 1908. List of species of ecto-
and endoparasites.

SIMPSON, W.J. A Treatise on Plague. Cambridge Univ. Press, London,
1906. Deals with historical, epidemiological, clinical, therapeutic
and preventive aspect of the disease.

THOMPSON, J.A. The Mode of Spread and P