1. Zeiss, apochromatic objective, 2 mm., aperture 14; Ocular No. 18 or 27.
2. Breinl, The Morphology and Life-history of Spirochæta Duttoni, Annals of Tropical Medicine and Parasitology (No. 3).
3. Breinl, Kinghorm, An Experimental Study of the Parasite of the African Tick Fever ((Siprochæta Duttoni), Memoir XXI. of the Liverpool School of Tropical Medicine.).
4. Dutton, Todd, The Nature of Human Tivk Fever in the Eastern Part of the Congo Free State (Memoir XVII. of the Liverpool School of Tropical Medicine).
5. A Note on the Structure of Spirochæta Duttoni;Stephens;THE LANCET,1906