CONTENTS. 



Frontispiece — Aquatic Larva, magnified (from an original 

 unpublished Drawing). 



PAGE 



Preface iii. 



Catalogue of Microscopic Objects - 1 



Chapter I. — Notes on Recent Improvements in Microscopes 19 



Chapter II. — General Observations on the Catalogue of Mi- 

 croscopic Objects 27 



Chapter III.-=-Test Objects 99 



Chapter IV. — Animals and Plants in which the Circulation 



has been observed under the Microscope 122 



Chapter V — Vie^^ong Microscopic Objects by Polarized Light 127 



Chapter VI.— Preparing Objects for the Microscope 131 



Chapter VII — Mounting Microscopic Objects 142 



C H apte r VIII. — Microscopical Fragments 153 



Chapter IX. — Achromatic Microscopes 173 



Chapter X — The Megaloscope fa new Optical Instrument) . 187 



39 



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