CONTENTS. 



DEDICATION. .... - iii 



PEEP ACE. .... - vii 



INTBODUCTION. - .... - xi 

 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, - ir, 



SIMPLE MICROSCOPES. 



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

 Power of Two or More Lenses When Used Together; Watch 

 Makers' Eye-GlassesSingle Lenses and Doublets; Engravers' 

 Glasses; Linen Provers; S-tanhope 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 MICROSCOPES. 



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 Naehet. Hartnaek and Gundlaeh, - el 



