The companion to the microscope with a description of C. Gould's improved pocket compound microscope 1829

Many persons who have purchased microscopes, after entertaining themselves and friends with the slides that accompany the instrument, have found themselves at a loss for new objects; consequently, it has been laid aside, as of little further use ; but no invention is capable of affording more entertainment and instruction than this instrument, opening a new world, and displaying the most extensive scenes of creative power, wisdom, and design. It is presumed this small treatise will be the means of showing a more extended field, as it contains every direction with regard to procuring and applying the most interesting subjects for examination by the Microscope : also the method of producing those wonderful objects of the minute creation, the animalcules in vegetable infusions. It comprises, likewise, a list of upwards of two hundred different objects, and a Description of C. Gould’s New Improved Pocket Compound Microscope, the most complete Microscope made. Its extreme portability and great magnifying power will recommend it strongly to the naturalist, mineralogist, and botanist, as it has sufficient powers to discover the most minute animalcule and seed vessels; it combines the uses of the Single, Compound, Opaque, and Aquatic Microscopes; and has been found, upon comparison, by several scientific gentlemen, superior in power and more distinct than many of the largest and most expensive instruments of the kind; —it shuts up in a case, three inches by three and a half, and may be carried in the pocket without the slightest inconvenience.