LIST OF ILLUSTRATIONS. 



FIG. PAGE 



1. Image formation by means of a pin-point aperture 16 



2. Image formation by a single lens *7 



3. Image formation by two lenses in series, without magnification 17 



4. Image formation by two lenses in series, with magnification of two 



diameters l8 



5. Image formation by two lenses in series, with magnification of three 



diameters l8 



6. Microscope objectives 20 



7. Sectional view of compound microscope 21 



8. Image formation in the compound microscope 22 



9. Image formation in the compound microscope with an eye-piece of higher 



power 22 



10. Central illumination by the Abbe condenser 24 



11. Illumination by a hollow cone of light 24 



12. Illumination by a broad convergent beam 24 



13. Dark-field condenser 25 



14. Optical parts of dark-field condenser 25 



15. Production of the "dark outline picture" 26 



16. Production of the "bright outline picture" 27 



17. Obliteration of outline by homogeneous illumination 27 



18. Microscope 29 



19. Abbe condenser 3 



20. Platinum needles 32 



21. Pasteur pipettes 33 



22. Hanging-drop preparation 34 



23. Cornet cover-glass forceps 3 8 



24. Stewart cover-glass forceps 38 



25. Novy's cover-glass forceps 38 



26. Kirkbride forceps for slides 39 



27. Schanze microtome 57 



28. Hot-air sterilizer 65 



29. Koch's steam sterilizer 66 



30. Diagram of the Arnold steam sterilizer 67 



31. Steam sterilizer, Massachusetts Board of Health 68 



32. Autoclave 69 



33. Apparatus for filling test tubes 89 



34. Potato tube 91 



35. Kock's serum sterilizer 93 



xvii 



