The Microscope: and Its Revelations |
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Page 52
... larger forms of " jelly - fish " with which every visitor to the sea- coast is familiar , it has been rendered certain that they too are developed from Polype larvæ , usually of very minute size , which give off Medusa buds ; so that ...
... larger forms of " jelly - fish " with which every visitor to the sea- coast is familiar , it has been rendered certain that they too are developed from Polype larvæ , usually of very minute size , which give off Medusa buds ; so that ...
Page 69
... image A B will be farther from it , and of larger dimensions ; but if the object A B be farther from the lens , the image ab will be nearer to it , and smaller than itself . Further , it is to be REFRACTION BY CONVEX AND CONCAVE LENSES .
... image A B will be farther from it , and of larger dimensions ; but if the object A B be farther from the lens , the image ab will be nearer to it , and smaller than itself . Further , it is to be REFRACTION BY CONVEX AND CONCAVE LENSES .
Page 73
... larger a ratio to its refractive power than does that of This experiment is best tried with a lens of long focus , of which the central part is covered with an opaque stop , so that the light passes only through a peripheral ring ...
... larger a ratio to its refractive power than does that of This experiment is best tried with a lens of long focus , of which the central part is covered with an opaque stop , so that the light passes only through a peripheral ring ...
Page 77
... larger is its angle of aper- ture ; since , the wider the divergence of the oblique rays from the axial ray , the greater will be the refraction which they will sustain in passing through a plate of glass , and the greater there- fore ...
... larger is its angle of aper- ture ; since , the wider the divergence of the oblique rays from the axial ray , the greater will be the refraction which they will sustain in passing through a plate of glass , and the greater there- fore ...
Page 78
... larger object situated at a greater distance . The picture formed upon the retina , therefore , by any object ( Fig . 10 ) , a b FIG . 10 . A B Diagram illustrating the action of the Simple Microscope . greater convexity , as that which ...
... larger object situated at a greater distance . The picture formed upon the retina , therefore , by any object ( Fig . 10 ) , a b FIG . 10 . A B Diagram illustrating the action of the Simple Microscope . greater convexity , as that which ...
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Common terms and phrases
acetic acid achromatic acid adjustment afford angle angular aperture animal Animalcules antheridia aperture appearance archegonia arrangement attached body calcareous Canada balsam cavity cells centre cilia color condenser consists containing convex convex lens corpuscles Crustacea cuticle diameter disk distance distinct Ditto Ehrenberg employed endochrome epithelium examination extra cloth extremely eye-piece fibres filaments fluid focus Foraminifera frustules furnished illumination inch Insects instrument Journal kind lacunæ larvæ layer lens lenses light magnifying power matter Medical membrane ment Microscopist milled head minute mode mounted movement nearly object-glass oblique observed octavo octavo volume ordinary organs particles peculiar plants plate portion present prism Prof rays refraction rendered resembling Rotifera scale seen segments separated shell side slide sometimes species specimens spicules stage stem stomata structure substance surface thickness thin glass tion tissue transparent transverse tube usually utricle Vegetable vessels Volvox whilst Zoophytes zoospores
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