CONTENTS. 



DLDICATION. -.......-iii 



PREFACE. _-...___ yii 



INTRODUCTION. - - - - - - - - > xl 



THE MICROSCOPE. 



What it Is ; What it Does ; Different Kinds of Microscopes ; Prin- 

 ciples of its Construction, and Glossary of Terms; Essential 

 Parts of the Microscope ; Names of the Different Parts, - 15 



SIMPLE MICROSCOPES. 



Hand Magnifiers, with One, Two, and Three Lenses ; Doublets ; 

 Power of Two or More Lenses When Used Together; Watch 

 Makers' Eye-Glasses Single Lenses and Doublets ; Engravers' 

 Glasses; Linen Provers; Stanhope Lens; Stanhope Collecting 

 Microscope ; Coddington Lens , Achromatic Doublets and Trip- 

 lets; Twenty-five Cent Microscopes Their Construction, and 

 How to Make Them ; Penny Microscopes, to Show Eels in Paste 

 and Vinegar ; Craig Microscope ; Novelty, Globe, etc., - 28 



DISSECTING MICEOSCOPES. 



Essentials of a Good Dissecting Microscope ; Cheap Stands for 

 Simple Microscopes, Excelsior Microscope; Raspail's Micro- 

 scope, Compact Dissecting Microscope;* Binocular Dissecting 

 Microscope, - - - - - - '/. " '- - 40 



COMPOUND MICROSCOPES. 



Cheap Foreign Stands; French Vertical Microscopes; Conversion 

 of Vertical Microscope into Collecting Microscope; the Boss 

 Model; The Jackson Model; The Continental Model; The New 

 American Model Cheap American Stands ; The Binocular Mi- 

 croscope ; The Binocular Eye-Piece ; The Inverted Microscope ; 

 Lithological Microscopes ; The Aquarium Microscope ; Micro- 

 scopes for Special Purposes ; "Class" Microscopes, - 46 



OBJECTIVES. 



Defects of Common Lenses; Spherical Aberration; Chromatic 

 Aberration , Use of Diaphragms ; Corrected Objectives ; Defining 

 Power , Achromatism , Aberration of Form ; Flatness of Field ; 

 Angular Aperture ; Penetrating Power ; Working Distance ; Im- 

 mersion and "Homogeneous " Lenses ; Lens Systems ; Duplex 

 Fronts , French Triplets ; Focal Length of the Numbers used to 

 Designate Objectives by Nachet, Hartnack and Gundlach; - 61 



