CHAP. I.

A concise History of the Invention and Improvements which have been made upon the Instrument called a Microscope. p. 1.

CHAP. II.

Of Vision; of the optical Effects of Microscopes, and of the Manner of estimating their magnifying Powers. p. 26.

CHAP. III.

A Description of the most improved Microscopes, and the Method of using them. p. 64.

CHAP. IV.

General Instructions for using the Microscope, and preparing the Objects. p. 129.

CHAP. V.

The Importance of Natural History; of Insects in general, and of their constituent Parts. p. 167.

CHAP. VI.

A general View of the internal Parts of Insects, and more particularly of the Caterpillar of the PhalÆna Cossus. A Description of sundry miscellaneous Objects. p. 334.

CHAP. VII.

The Natural History of the Hydra, or Fresh Water Polype. p. 357.

CHAP. VIII.

Of the Animalcula Infusoria. p. 415.

CHAP. IX.

On the Organization or Construction of Timber, as viewed by the Microscope. p. 574.

CHAP. X.

Of the Crystallization of Salts, as seen by the Microscope; together with a concise List of Objects. p. 600.

CHAP. XI.

An Arrangement and Description of minute and rare Shells. A descriptive List of a Variety of vegetable Seeds, as they appear when viewed by the Microscope. By the Editor. p. 629.

CHAP. XII.

Instructions for collecting and preserving Insects. A copious List of microscopic Objects. By the Editor. p. 665.

ADDITIONS. p. 713.