The Microscope: Its History, Construction, and Application: Being a Familiar Introduction to the Use of the Instrument, and the Study of Microscopical ScienceG. Routledge and Sons, 1871 - 762 pages |
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achromatic acid algæ angle angular aperture animal animalcules Annelids aperture appearance arrangement attached axis beautiful become body bone-cells calcareous Canada balsam cavity cells centre cilia circular colour composed condenser consists covered crystals delicate dentine deposited diameter Diatoms disc edge eggs epithelium examination exhibit eye-piece fibres filaments fluid focus Foraminifera glass hairs Haversian canals horny illumination inch Infusoria insect instrument larvæ layer lens lenses lines magnifying power mass matter membrane ment micro microscope microscopist minute motion mounted mounted dry muscular nucleolus nucleus object object-glass oblique observed obtained opaque organs peculiar piece placed plants Plate polarised light polype portion present prism produced rays refraction resembling round scales screw seen shell side siliceous slide solution species specimens spicula spiral sponge spores stage structure substance surface teeth tentacles thickness thin tion tissue transparent transverse tube vegetable vessels Volvox Vorticella zoospores
Popular passages
Page 653 - Contrivance intricate, expressed with ease, Where unassisted -sight no beauty sees, The shapely limb and lubricated joint, Within the small dimensions of a point, Muscle and nerve miraculously spun, His mighty work, who speaks and it is done, The invisible in things scarce seen revealed, To whom an atom is an ample field; To wonder at a thousand insect forms.
Page 445 - All these things live and remain for ever for all uses, and they are all obedient. •• .•- * ' ."..... JIT. All things are double one against another : and he .hath made nothing imperfect.
Page 490 - ... of branches and branchlets and sprigs of flowers. There are also solid coral hemispheres like domes among the vases and shrubbery, occasionally ten or even twenty feet in diameter, whose symmetrical surface...
Page 444 - Consider their incredible numbers, their universal distribution, their insatiable voracity; and that it is the particles of decaying vegetable and animal bodies which they are appointed to devour and assimilate. Surely we must in some degree be indebted to those ever active invisible scavengers for the salubrity of our atmosphere.
Page 110 - ... the circulation of the blood in the web of a frog's foot ; also three good objects to test the different object-glasses, one hollowed and two plain slips, some thin glass.
Page 580 - If, while we dissect with care the larger animals, we are filled with wonder at the elegant disposition of their limbs, the inimitable order of their muscles, and the regular direction of their veins, arteries, and nerves, to what a height is our astonishment raised when we discover all these parts arranged in the least in the same regular manner...
Page 281 - ... opening, these are at first very minute ; though they rapidly increase in size. The segments are separated by the elongation of the connecting tube, which is converted into two roundish hyaline lobules. These lobules increase in size, acquire colour, and gradually put on the appearance of the old portions. Of course, as they increase, the original segments are pushed further asunder, and at length are disconnected, each taking with it a new segment to supply the place of that from which it has...
Page 47 - It consists of two planoconvex lenses, with their plane sides towards the eye, and placed at a distance apart equal to half the sum of their focal lengths, with a stop or diaphragm placed midway between the -lenses. Huyghens was not aware of the value of his eye-piece, it was reserved for Boscovich to point out that he had by this important arrangement accidentiilly corrected a great part of the chromatic aberration. Let fig. 107 represent the Huyghenian eye-piece of a microscope, FF being the fieldglass...
Page 23 - ... and mathematicians have shown how spherical aberration may be entirely removed by lenses whose sections are ellipses or hyperbolas. This curious discovery we owe to Descartes. If a I, a I
Page 123 - A, which can be removed at pleasure. Below the prism is an achromatic eye-piece, having an adjustable slit between the two lenses ; the upper lens being furnished with a screw motion to focus the slit. A side slit, capable of adjustment, admits, when required, a second beam of light from any object whose spectrum it is desired to compare with that of the object placed on the stage of the Microscope. This second beam of light strikes against a very small prism suitably placed inside the apparatus,...