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 the Eyes *■ 



CHAPTER II. 



JANUARY. 



Yisit to the Ponds— Confervse— Spirogyra quinina— Vorti- 

 cella— Common Rotifer— Three Divisions of Infusoria— 

 Phytozoa— Protozoa— Rotifera— Tardigrada— Meaning 

 of these Terms— Euglena3— Distinction between Animals 

 and Vegetables— Description of Yorticella3— Dark- 

 ground Illumination— Modes of producing it— The 



