The book Natural Philosophy for General Readers And Young was written by author A Adolphe Ganot Here you can read free online of Natural Philosophy for General Readers And Young book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Natural Philosophy for General Readers And Young a good or bad book?
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299. If the object is opaque it is illuminated above by a con- densing lens, L (fig. 298), the focus 4 of which is formed upon the object itself. 370. Origin and use of the mi- croscope. The invention of the microscope does not extend further back than the commencement of the seventeenth century, which is surprising, for it had long been known that a drop of water placed in a small hole in a thin opaque plate magnified objects seen through it. From the commencement of the first century, A. D. ,... the philosopher Seneca announced that writing appeared larger under a glass globe containing water. Finally, in the thirteenth century, spectacles were used, that is, magnifying glasses, to assist the. Sight of the aged. The inventor 374 On Light. [370- of the microscope is not known ; it has, probably, only acquired its present form after numerous successive improvements. The microscope has been the origin of discoveries in the vege- table and animal kingdom, as curious as they are varied. Botanists owe to it their most beautiful discoveries on the structure of the cellular tissue in plants, the circulation of the sap, the function of leaves in the respiration of vegetables.
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