ENTOMOLOGY

DISEASES CAUSED OR CARRIED BY MITE'S AND TICKSand nymphal stages, and does not reattach during the adult stage. Theorganism, if taken up, must be taken up by the larva or nymph andremain in the body during transfo_frnation, entering the eggs, thus to betransmitted by the offspring of the'tick.. It is quite evident from this that anyone who studies the transmissionof disease by ticks, must first take into account the life cyclesof the ticks which he is studying, in order to arrive at any understandingof the life cycles of the parasites. Perhaps we may learn a valuable lessonfrom the ticks in our search for the life cycles of parasites in other formsof invertebrates.4fl7LIST OF REFERENCESAnderson, John F., 1903.-U. S. Treas. Dept., Hyg. Lab., Bull. 14,pp. 1-41.Balfour, A., 19l!.-Parasitology, vol. 5, pp. Iflfl-l!6.Banks, N., 1915.-U. S. Dept. 'Agric., Office of the Secretary, Report lOS,153 pp.Brumpt, E., 1905.-BuII. Soc. Path. Exot., vol. 1, pp. 577-579.Brumpt, E., 1913.-Precis de Parasitologie, pp. 133, 136.Brumpt, E., 1914.-BuII. Soc. Path. Exot., vol. 7, No.2, pp. 13fl-133.Carpano, M., 1915.-Ann. Igiene Speriment, Turin, vol. fl5, No.4, pp.343-410.Castellani, A., and Chalmers, A. J., 1913.-A Manual of Tropical Medicine,flnd Edit., p. 950.Christophers, S. R., 1907.-Sci. Mem. Officers Med. & Sanit. Dept., India,n. s., No. 29. ,Christophers, S. R., 1912.-Parasitology, vol. 5, No.1, pp. 37-44, 4S.Crawley, H., 1915.-Journ. Parasit., vol. fl, No. fl, pp. S7-9fl.Doflein, F., 1911.-Lehrbuch der Protozoenkunde, p. S17.Dutton, J. E., and Todd., J. L., 1905.-Liverpool School Trop. Med.,Mem. 17, pp. I-IS.Fiilleborn and Mayer, M., 1905.-Arch. f. Schiffs- u. Trop.-Hyg., vol.12, p. 31.Hadwen, S., 1919.-Journ. Amer. Vet. Med. Assoc., vol. 54, No.6, pp.639-64fl:Hindle, E., 1911.-Parasitology, vol. 4, No.2, pp. 133-149. ContainsBibliography on Transmission of Relapsing Fever.Hindle, E., 1911.-Parasitology, vol. 4, pp. 463-477.Jarvis, E. M., 1919.-Vet. Journ., Feb.Kitashima, T., and Myajima, 1915.-Kitasato Arch. Exper. Med., vol.2, No. fl, July, pp. 91-146, PIts. 1-4; No.3, pp. fl37 for'd.Leishmann, W. B., 1910.-Lancet, vol. 177, pp. 11-14.