Journal of the Royal Microscopical SocietyRoyal Microscopical Society, 1884 |
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Términos y frases comunes
acid alcohol algæ Amer angle animal aperture appear axial axis bacteria bands become body Brantfell Bréb Canada balsam cell-wall cells central Centralbl chitinous chlorophyll chromatophore cilia Claife Heights cœlom colour connected consists cover-glass crystals described diameter diatoms disintegration embryo Engl examination eye-piece filaments fluid formation ganglion gemmules genus germinal germinal vesicle glass glycerine granular increase Infusoria insects Journ large number larva larvæ layer light Lindeth lines mass matter Mech membrane Micr Microscope microscopists mounted muscular fibre nerves nucleus object oblique observed obtained optical organs ovum pencils pigment plants plate portion present Proc Prof protoplasm quantity rays refractive regard rotifers sections seen segments sewage side slide species specimens spermatoblast spermatozoa spores staining striæ structure substance surface thallus tion tissue transverse Trentepohlia tube vegetable vesicle xanthophyll XXXVIII yellow Zool zoospores
Pasajes populares
Página 128 - ... produced indirectly rather than by the direct action of the diamond in cutting a groove in the glass. They can be protected to a certain extent by a cover-glass, but they are liable to undergo changes which will affect their original structure. Except for purposes of investigation, therefore, there is no advantage to be gained by ruling lines of this character. Three conditions must be fulfilled in the production of lines having a permanently good character: 1. The glass must be tough. There...
Página 127 - I removed the cover and cleaned one-half of the surface of the glass by rubbing with chamois skin. The difference in the appearance of the two halves is now very marked. Above, the dense black lines remain. Below, a ragged abrasion of the surface of the glass has taken place. Above, the furrowed lines as originally formed are preserved ; below, there is a coarse scratch. It may bo said that the action in this case is accidental and abnormal.
Página 127 - To one who is familiar with Nobert's bands, a perfect line need not be described. It is densely black, with at least one edge sharply defined. Both edges are perfectly smooth. Add to these characteristics a rich black gloss, and you have a picture of the coarser lines of a perfect Nobert plate. How are those lines produced ? In the study of the action of a diamond in producing a breaking fracture in glass, the microscope seems to be of little service, but we can call it to our aid in the study of...
Página 463 - ... in excess ; the precipitate is washed with distilled water till the wash-water no longer gives a precipitate with a solution of mercuric chloride, then decomposed by sulphuretted hydrogen ; the filtrate is evaporated to a syrupy consistence, and dried over the water-bath ; and the dark purple product thus obtained is treated with alcohol, which extracts the carminic acid.
Página 33 - The author's observations have been made on certain pits in the district about Cambridge which are filled with the fine mud produced in washing out the phosphatic nodules from the " Cambridge Greensand "—a seam at the base of the Chalk Marl. As the water gradually dries up, a surface of extremely fine calcareous mud is exposed. This deposit is often very finely laminated, and occasionally among the...
Página 135 - I do not need to say that I have no personal ends to serve in an inquiry in which I happen to be a personal factor. Let us then have a test which will forever set at rest this vexed question of resolution. I submit for your consideration the following outline of a test which I venture to think will be sufficient and conclusive: Let Mr. Fasoldt rule three plates under as nearly the same conditions as possible, except in the number of lines in the different bands of each plate. Let him label each plate...
Página 459 - To spread the wings of a small insect, the above-mentioned small dots may be made in a row. The belly of the specimen is applied to the middle spot, and by a bristle one wing may bo applied to the dot on the one side, and the other wing to the third dot.
Página 262 - ... the infusions contained amongst other ferments one special kind, noticeable by its extreme activity. In appearance it closely resembles the butyric ferment, being composed of small cylindrical rods rounded at the extremities, generally isolated, or, when joined, two by two, acting as one body. They move rapidly with a wriggling motion and often bend their bodies until they form a perfect circle.
Página 218 - ... smaller than the corresponding ones on the opposite side of the body. The dissevered foot was also restored. The loss of the opportunity to see the manner in which the legs were restored during moult was greatly regretted ; but we have some clue from the careful and interesting studies of Mr. Blackwall. Several spiders whose members had been previously amputated, were killed and dissected immediately before moulting. In one of these the leg which was reproduced was found to have its tarsal and...
Página 314 - ET Draper recommends a cone of pasted paper to be made rather larger than the specimen, with the apex cut off. A vigorous spider will soon project its head through the aperture. When in this position it should be blocked behind with cotton wool slightly wetted. The cone can then be gummed to a slip, apex upwards. ' Many insects can be arranged in the same way for the observation of facial movements, and such front views admit of interesting and extended study, the action of the antennae, palpi, and...