Journal of the Royal Microscopical SocietyRoyal Microscopical Society, 1878 |
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Página 2
... possible position . Even when compara- tively large specimens and a low magnifying power are used , the special characters observed by this method depend entirely upon the collection by an object - glass of more or less divergent rays ...
... possible position . Even when compara- tively large specimens and a low magnifying power are used , the special characters observed by this method depend entirely upon the collection by an object - glass of more or less divergent rays ...
Página 4
... possible , a number of precautions must be taken , which are all simple enough , but it would occupy too much time to describe them in detail . With proper care the errors in the values of t and d ought to be certainly less than Too of ...
... possible , a number of precautions must be taken , which are all simple enough , but it would occupy too much time to describe them in detail . With proper care the errors in the values of t and d ought to be certainly less than Too of ...
Página 9
... possible to determine the indices with considerable accuracy . It will , however , I hope , be enough to indicate what we might expect to be able to learn by applying the method to the study of thin sections of rocks . For some time The ...
... possible to determine the indices with considerable accuracy . It will , however , I hope , be enough to indicate what we might expect to be able to learn by applying the method to the study of thin sections of rocks . For some time The ...
Página 10
... possible to obtain satisfactory results with sections sufficiently thin to be useful for ordinary microscopical examination , since it appeared probable that the errors of observation would be as great as the differences between the ...
... possible to obtain satisfactory results with sections sufficiently thin to be useful for ordinary microscopical examination , since it appeared probable that the errors of observation would be as great as the differences between the ...
Página 11
... the results . The mineral observed ought to be as near to the edge as possible , to avoid any errors due to varying thickness . As an illustration of the use of this method , The President's Address , H. C. Sorby , F.R.S. , P.G.S. 11.
... the results . The mineral observed ought to be as near to the edge as possible , to avoid any errors due to varying thickness . As an illustration of the use of this method , The President's Address , H. C. Sorby , F.R.S. , P.G.S. 11.
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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
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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...