CONTENTS. 



CHAPTER I. 



MICROSCOPES AND THEIR MANAGEMENT. 



. PAGE 



Powers that are most serviceable — Estimated by Focal 

 length — Length of Body of Microscope and its Effects — 

 Popular Errors about Great Magnification — Modes of 

 Stating Magnifying Power — use of an "Erector" — Power 

 of various Objectives with different Eye-pieces — Exami- 

 nation of Surface Markings — Methods of Illumination 



^ — Direct and Oblique Light — Stage Aperture — Dark- 

 ground Illumination — Mode of Softening Light — Micro- 

 scope Lamps — Care of ihe IJyes .. . . . .1 



CHAPTER n. 



JANITART. 



Yisit to th.e Ponds — Confervae — Spirogyra quinina — Yorti- 

 cella — Common Rotifer — Three Divisions of Infusoria — 

 Phytozoa — Protozoa — Rotifera — Tardigrada — Meaning 

 of these Terms — Euglense — Distinction between Animals 

 and Yegetables — Description of YorticeUse — Dark- 

 ground Illumination — Modes of producing it— The 



