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 Prevention of Plague in Australia. _Lancet_, Oct. 19, 1907, p. 1104. Rat fleas the essential factor in transmitting plague, and preventive methods should be directed against the rats. THOMPSON, J.A. On the Epidemiology of Plague. _Jour. Hyg._, Vol. VI, No. 5, Oct., 1906. Methods of infection, spread, relation of rats to the disease and a review of the rat-flea theory. Bibliography. VERJBITSKI, D.T. The Part Played by Insects in the Epidemiology of Plague. _Jour. Hyg._, 8, 1908, No. 2, pp. 162-208. Record of extensive experiments with fleas. Fleas communicated plague for three days, bedbugs for five days. Interrelation of fleas, rats, dogs, cats, and man. An important article translated from Russian. WHERRY, W.B. Further Notes on the Rat Leprosy and on the Fate of the Human and Rat Leper Bacillus in Flies. _Jour. Infec. Diseases_, Vol. 5, No. 5, 1908. Discussion and references, experiments with flies, summary, etc. More than 1,115 lepra-like bacilli were counted in a single fly-speck. WHERRY, W.B. Plague Among the Ground-squirrels of California. _Jour. Infec. Diseases_, Vol. 5, No. 5, 1908, pp. 485-533. How the plague was first discovered among rats, records of cases and a discussion of the possible relation of this to human plague cases. Eradicating Plague in San Francisco; Report of the Citizens' Health Committee, 1909. An account of the recent outbreaks and the methods of fighting them. Report of the Indian Plague Commission, Vol. V, pp. 75-77, 1901. In these pages the Commission considers the question of the transference of plague by suctorial insects. It considers Simonds' claims and others and believes that "suctorial insects do not come under consideration with the spread of plague."