6Numerical Aperture.
22Diatomaceæ, Recent and Fossil.
7CHAPTER II.
23CHAPTER II.
8Messrs. Watson’s Microscopes.
24Infusoria.
9Continental Microscopes.
25Porifera. Spongiadæ.
10Relative Merits of the English and German Objectives.
26Bryozoa, Moss-animals.
11Abbe’s Condenser.
27Annulosa, Worms, and Entozoa.
12Accessories of the Microscope.
28Crustacea.
13Polarisation of Light.
29CHAPTER V.
14Method of using the Micro-Spectroscope.
30CHAPTER VI.
15Directions for finding the best Focus.
31Appendix D.
16Staining Animal Structures.
32Memorable Quotes