Journal of the Royal Microscopical SocietyRoyal Microscopical Society, 1878 |
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Página 11
... edge of the section . Fig . 7 shows what would then be the general relation of the different parts as seen in section . The thickness and effect of the covering glass ( g ) may then be entirely neglected , since the true distance ...
... edge of the section . Fig . 7 shows what would then be the general relation of the different parts as seen in section . The thickness and effect of the covering glass ( g ) may then be entirely neglected , since the true distance ...
Página 12
... edge of a thin plate of rock covered with a thin glass which projects beyond it , the space between the two glasses being filled with hard Canada balsam ( b ) , as shaded . Now in this case , if we measure the apparent thick- ness of ...
... edge of a thin plate of rock covered with a thin glass which projects beyond it , the space between the two glasses being filled with hard Canada balsam ( b ) , as shaded . Now in this case , if we measure the apparent thick- ness of ...
Página 14
... edge that direct comparison with the balsam might lead to serious error . This difficulty may be overcome by comparing it directly with some other mineral the index of which is either known or has been previously determined . For this ...
... edge that direct comparison with the balsam might lead to serious error . This difficulty may be overcome by comparing it directly with some other mineral the index of which is either known or has been previously determined . For this ...
Página 19
... FIG . 5. - One of the indices shown in perspective . thickness , polished on the cylindrical edge , and ground c 2 ( 19 ) -Description of Professor Abbe's Apertometer, with Instructions its Use By Carl Zeiss, of Jena (Plate II.
... FIG . 5. - One of the indices shown in perspective . thickness , polished on the cylindrical edge , and ground c 2 ( 19 ) -Description of Professor Abbe's Apertometer, with Instructions its Use By Carl Zeiss, of Jena (Plate II.
Página 20
thickness , polished on the cylindrical edge , and ground to an angle of 45 ° in the direction of the diameter . This disk being put on the stage of a microscope , the rays admitted by the cylindrical edge of the disk horizontally are ...
thickness , polished on the cylindrical edge , and ground to an angle of 45 ° in the direction of the diameter . This disk being put on the stage of a microscope , the rays admitted by the cylindrical edge of the disk horizontally are ...
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Términos y frases comunes
acid action alulæ Amphiuma angle angular aperture aniline animal aperture apparatus appear axis Bacteria Bacterium balsam blood body Canada balsam cells centre chromic acid coloured blood-corpuscles condenser contraction corpuscles covering glass crystals described diameter diatoms disk distinct double contour edge examination eye-piece filaments flagella flagellum fluid focal Fossil Foveaux Strait Frank Crisp genus glycerine granules Heliozoa illumination immersion inch Infusoria insects length lenses light magnified mastax matter measured membraneous layer method Micro millimetre mineral minute nucleus object object-glass oblique observed obtained optical ordinary organs paper Petit picric acid plate preparation present President prism Professor protoplasm Radiolaria rays reagent refraction rotifers ROYAL MICROSCOPICAL SOCIETY seen slide solution species specimens sponge spores staining stomata striæ structure substance surface teeth termo thickness thin tion tissues tube valve whilst woodcut
Pasajes populares
Página 229 - Report on the Hydroida collected during the Exploration of the Gulf Stream by LF de Pourtales, Assistant United States Coast Survey.
Página 90 - LIGHT: a Series of Simple, entertaining, and Inexpensive Experiments in the Phenomena of Light, for the Use of. Students of every age.
Página 125 - ... unfetters the mind from prejudices of every kind, and leaves it open and free to every impression of a higher nature which it is susceptible of receiving, guarding only against enthusiasm and self-deception by a habit of strict investigation, but encouraging, rather than suppressing, everything that can offer a prospect or a hope beyond the present obscure and unsatisfactory state.
Página 159 - The following list of presents was read, and the thanks of the meeting were voted to the respective donors ; viz., FOR THE LIBRARY.
Página 55 - numerical aperture " is equal to the product of the refractive index of the medium in front of the objective, multiplied into the sine of the semi-angular aperture=n sin. w. This definition of "numerical aperture" offers at once a means by which all objectives, whether dry, water, or oil .immersion, can be directly compared. It is based on the theory whence Professors Abbe and Helmholtz deduced the limit of visibility. The...
Página 160 - The President proposed a vote of thanks to the author of the paper, and also to Mr.
Página 33 - President, in the chair. The minutes of the preceding meeting were read and confirmed.
Página 123 - In mathematics, chemistry, and every branch of natural philosophy, how many are the inquiries necessary for their improvement and completion, which, taken separately, do not appear to lead to any specifically advantageous purpose ! Ho'w many useful inventions, and how much valuable and improving knowledge, would have been lost, if a rational curiosity, and a mere love of information, had not generally been allowed to be a sufficient motive for the search after truth !" — Malthus's Principles of...
Página 93 - Society during the past month was read by the Secretary, and the thanks of the meeting were voted to the donors.
Página 182 - ... is as a rule prevented. I may add that Mr. Gosse has already dealt with the action of the manubria in other rotifers (I. c.). Now I do not know how it may strike others, but to me this mechanism is simply exquisite. We have three distinct lines of power, all at work and in rotation. In the first place there is a power at hinge K, then follows the power at hinge H, and then lastly comes that of the manubria ; the moment the main upper handles of the ramus get together, then, and not before, up...