LIST OF ILLUSTRATIONS 



Fig, Paqe 



1. Image formation by means of a pin-point aperture i6 



2. Image formation by a single lens 17 



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



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



meters 18 



S- Image formation by two lenses in series, with magnification of three 



diameters 18 



5. 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 AbbS condenser 24 



11. Illumination by a hollow cone of light 24 



12. Illumination by a broad convergent beamT 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. Abb6 condenser 30 



20. Platinum needles 32 



21. Pasteur pipettes ^ 33 



22. Hanging-drop preparation 34 



23. Cornet cover-glass forceps 38 



24. Stewart cover-glass foirceps. '..... 38 



25. Novy's cover-glass forceps 38 



26. Kirkbride forceps for slides 39 



27. Microtome 57 



28. Hot-air steriUzer •. 65 



29. Koch's steam sterilizer 66 



30. Diagram of the Arnold steam sterilizer. 67 



Steam sterilizer, Massachusetts Board of Health 68 



Autoclave , 69 



Dissociation curves of indicators 90 



34. Apparatus for filling test tubes. . , 91 



XV 



31 

 32 



33 



