CONTENTS. ix 



PART IV. 

 THEORY OF MICROSCOPIC OBSERVATION. 



CHAP. PAGE 



INTRODUCTION .. 189191 



I. SPHERICAL AND CYLINDRICAL OBJECTS ... 191217 



1. AIR-BUBBLES IN WATER 191202 



2. GLOBULES OF OIL IN WATER 202206 



3. HOLLOW SPHERES AND HOLLOW CYLINDERS 206 217 



II. OBJECTS OF IRREGULAR FORM ... 217226 



1. MEMBRANES WITH SMALL DEPRESSIONS OR 



HOLES 217219 



2. MEMBRANES BOUNDED BY ONE PLANE AND 



ONE UNDULATING SURFACE 219, 220 



3. MEMBRANES BOUNDED BY PARALLEL UNDU- 

 LATED SURFACES 220, 221 



4. ALTERNATE SOLID AND AQUEOUS LAYERS ... 221 



5. ELEVATIONS AND DEPRESSIONS AS OPPOSED TO 



DENSE AND LOOSE LAYERS 221 , 222 



6. VISION THROUGH STEREOSCOPIC BINOCULAR 



MICROSCOPES 222 226 



III. INTERFERENCE PHENOMENA ... ... 226247 



A. IN THE MICROSCOPE : 



1. Delineation of the Fine Structure of 



Objects by Interference 226 236 



2. Reflexion of Light by Small Spheres, 

 Granules, Fine Threads, &c., and the 

 Interference Phenomena thereby pro- 

 duced 236239 



3. Interference Lines caused by the with- 

 drawal of a Source of Light of small 

 extent 239, 240 



B. INTERFERENCES IN THE PLANE OF ADJUST- 



MENT : 



1. Interference of Direct with Reflected 



Light 240243 



2. Interference of Refracted .with Reflec- 

 ted Light 244 



3. Interference of Refracted and Direct 



Light 245 



4. Interference Colours of Thin Plates ... 245247 



IV. OBLIQUE ILLUMINATION ... 247251 



V. THE PHENOMENA OF MOTION ... 252, 253 



VI. DIFFERENCES OF LEVEL.. ... 254,255 



