LIST OP ILLUSTRATIONS. 



WOOD ENGKAVINGS AND PHOTOGRAPHS. 



FIG. PAGE 



1. Asoocoocns Billrothii, x 65 (Gohn) . . 14 



2. Spiroohseta from Sewage Water, x 1200 (E.M.O.) 15 

 B. Flagella (Koch, Brefeld, Warming, Zopf) 16 

 i. Bacillus Megatherium (De Bary) . . 17 



5. Clostridium Butyricum, x 1020 (Prazmowski) . . .IS 



6. Leuconostoc- Meseuteroides ; Cocci-chains with Arthrospores (Van 



Tieghem and Cienkowski) ..... 19 



7. Spore-bearing Threads of Bacillus Anthracis, double-stained with 



Fuchsine and Methylene Blue, x 1200 (E.M.C.) 20 



8. Bacilli of Tubercle in Sputum, x 2500 (E.M.C.) . 21 



9. Comma Bacilli in Sewage Water, stained with Gentian Violet, x 1200 



(E.M.C.) . 22 



10. Vibrios in Water contaminated with Sewage, x 1200 (E.M.C.) 22 



11. Refraction of Light (Carpenter) . . 66 



12. Spherical Aberration (Carpenter) . , 67 



13. Combination of Lenses in Abba's Homogeneous Immersion (Car- 



penter) . . . ' 67 



14. Chromatic Aberration (Carpenter) 68 



15. Objective with Collar Correction (Zeiss) . 69 



16. Microscope— English Model (Swift) 71 



17. Removable Mechanical Stage (Swift) 72 



18. Microscope — Continental Model (Zeiss) . 7.S 



19. Iris Diaphragm (Zeiss) , 74 



20. Abba's Condenser (Zeiss) . 75 



21 . Microscope Lamp (Baker) . 6 



22. Large Microscope Lamp (Swift) . , .77 



23. Arrangement of Powell and Lealand's Microscope in working directly 



on the Edge of the Flame, with Stand for Micrometer Eye-piece to 

 secure Steadiness and Accuracy of' Measurement (Carpenter after 



Nelson) . ..... 79 



24. Ramsden Micrometer Eye-piece (Swift) . . 80 



25. Micrometer Eye-piece (Zeiss) 81 



26. Inoculating Needles (E.M.C.) . 84 



27. Freezing Microtome (Swift) 94 

 ,28. Microtome (Jung) . . 95 



29. Wire-cage for Test-tubes (Muencke) . 100 



30. Hot-air Steriliser (E.M.C.) . 101 



