. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. PEACTICAL TREATISE ON. power was increased by draw tubes from 40 to 140 times. The latter, S. Campani of Bologna, was also a maker of telescopes and microscopes, and a successful rival of the former, his instrument was somewhat similar to that made by Divini, being on the principle of an inverted telescope. Campani'a lenses are said to have been worked on a turn-tool, and not moulded. In 1672, we find that S. P. Salv
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. PEACTICAL TREATISE ON. power was increased by draw tubes from 40 to 140 times. The latter, S. Campani of Bologna, was also a maker of telescopes and microscopes, and a successful rival of the former, his instrument was somewhat similar to that made by Divini, being on the principle of an inverted telescope. Campani'a lenses are said to have been worked on a turn-tool, and not moulded. In 1672, we find that S. P. Salvetti made micro- scopes in imitation of those of Divini and Campani, which were found to far exceed those of the above-mentioned artists in their magnifying and defining powers; but we are not told in what points of construction these instru- ments differed from those of his prede- cessors. In the year 1673, the name of the immortal Leeuwenhoek first appears in the Philosophical Transactions of this country, as a discoverer of nu- merous wonders by aid of the micro- scope; his instruments, which were composed of single lenses, are said to have been greatly superior to all that had been pre- viously made. According to Baker, they were also remarkable for their simpUcity, each one consisting of a single lens set between two plates of silver, perforated with a small hole, with a moveable pin before it, to place the object on and adjust it to the eye of the beholder. "It has been stated by many authors," says Baker ( On Microscopes, vol. ii.), «that the magnifiers used by Leeuwenhoek were globules or spheres of glass, like those invented by Hooke, but such is not the case; he assures us that in the cabinet of the twenty-six micro- Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Quekett, John,
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