Nature . 68 CORNHILL, LONDON, Eu-r,ived Real size,AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Allen in K7ioivlcdge, The Platyscopic Lens is invaluable to botanists, mineralogists, or ento-mologists, as it focuses about three times as far from the object as theCoddington Lenses. This allows opaque objects to be examined easily. The Platyscopic Lens is made of foi ? dei^rees of power, magnifyingrespectively lo, 15, 20, and 30 diams. ;

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Nature . 68 CORNHILL, LONDON, Eu-r,ived Real size,AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Allen in K7ioivlcdge, The Platyscopic Lens is invaluable to botanists, mineralogists, or ento-mologists, as it focuses about three times as far from the object as theCoddington Lenses. This allows opaque objects to be examined easily. The Platyscopic Lens is made of foi ? dei^rees of power, magnifyingrespectively lo, 15, 20, and 30 diams. ; ih .\o^ftst power, having the largestfield, is the best adapted for general use. The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. Price of the Platyscopic Lens, vtonnted in Tortoiseshell, vtagnifyifig either ID, T5, 20, or 30 diameters, eachpower^ 15s. In nicfeelised German Sitver, each poivcr, 17s. 6d. Illustrated Description sent free. JOHN BROWNING, 63 STRAND. LONDON, SPECTACLESELECTRIC UCHT, I

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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience