occidentalis_). _Jour. Amer. Med.
Assn._, Vol. 47, Aug., 1906, p. 358. Guinea-pig successfully
inoculated by means of tick.

RICKETTS, H.T. The Role of the Wood-tick (_Dermacentor
occidentalis_) in Rocky Mountain Spotted Fever. _Jour. Amer. Med.
Assn._, Vol. 49, July 6, 1907, pp. 24-27. Notes on experiments
conducted and studies made. Takes position that these experiments
connect the tick with the transmission of the fever.

ROBINSON, A.A. Rocky Mountain Spotted Fever. _Med. Rec._, Nov. 28,
1908. Occurrence and distribution of the disease; review of the
various theories in regard to its transmission. P.E. Jones of Salt
Lake believes it is transmitted by mosquitoes.

STILES, C.W. A Zooelogical Investigation Into the Cause,
Transmission and Source of Rocky Mountain Spotted Fever. _Hyg. Lab.
Pub. Health and Mar. Hospt. Ser., Bull. 20_, 1905. Does not find
the parasite that had been recorded by others, and finds no
evidence to indicate that the ticks transmit the disease.

WILSON, L.B., AND CHANNING, W.M. Studies in _Pyroplasmosis hominis_
(Spotted Fever or Tick Fever of the Rocky Mountains). _Jour. Infec.
Diseases_, 1, 1904, pp. 31-57. Evidence that the disease is
transmitted solely by means of the ticks.

TICKS AND VARIOUS DISEASES

BANKS, NATHAN. Tick-borne Diseases and Their Origin. _Jour. Eco.
Ento._, Vol. I, No. 3, 1908, pp. 213-215. Shows how ticks may
become important disease-carriers by changing their hosts as the
normal host is exterminated, or for other reasons.

BANKS, NATHAN. A Revision of the Ixodoidea or Ticks of the United
States. _Tech. Series No. 15, Bull. of Bureau of Ento., U.S. Dept.
Agric._, 1908. Structure, life-history, classification, catalogue,
bibliography.

BARBER, C.A. The Tick Pest in the Tropics. _Nature_, 52, 1895, pp.
197-200. Direct and indirect effects of ticks on their hosts.

CHRISTY, C. _Ornithodoros moubata_ and Tick Fever in Man. _Brit.
Med. Jour._, Vol. II, 1903, p. 652. Relation of the tick to
_Filaria perstans_.

DUTTON, J.E., AND TODD, J.L. The Nature of Human Tick Fever in the
Eastern Part of the Congo Free State with Notes on the Distribution
and Bionomics of the Tick. Liverpool School of Tropical Medicine.
_Memoir_, 17, Nov., 1905, pp. 1-18.

HOOKER, W.A. A Review of the Pres