Caelebs from caelestium vitam ducens, b being put for consonantal u because a consonant cannot be put before another consonant; deterior from the verb detero, deteris; potior (adj.) from potior, potiris; arbor from robur; verbum from verberatus aeris, &c. Nor is he always right in Greek usages.
The rough adjustment of the microscope can be made by a rack and pinion F; and the fine adj ustment by the screw G.
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