Journal of the Royal Microscopical SocietyWilliams & Norgate, 1884 |
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Otras ediciones - Ver todas
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 colourless connected consists cover-glass crystals described diameter diatoms ectoderm embryo Engl examined eye-piece fibres filaments fluid formation ganglion gemmules genera genus germinal Gesell glass glycerine infusoria insects Journ large number larva larvæ latter layer light Lindeth lines Mech membrane Micr Microscope microscopists mounting mucilage muscular nerves nervous nucleus object oblique observed obtained optical organs ovum pencils pigment plants plate portion present Proc produced Prof protoplasm quantity rays refractive regard rotifers sections seen segments sewage side slide solution species specimens spermatozoa sporangia spores stage staining structure substance surface tion tissue transverse Trentepohlia tube vesicle xanthophyll yellow Zool zoospores
Pasajes populares
Página 402 - ... thicker consistence than the similar bodies, which, in the ordinary method, instantly assume the Actinophrys form. After both had passed completely through, for nearly a minute they lay quiet, gradually elongating meanwhile. Then a tremor became visible at one end, and a short prolongation of the sarcode appeared waving to and fro. This elongated at the same time into a flagellum, the vibrations becoming more rapid, until at the same moment both the liberated monads darted away through the water....
Página 442 - R. Heyl, of the city and county of Philadelphia and state of Pennsylvania, have invented a new and useful improvement in...
Página 471 - I have often wondered why naturalists usually used carmine solutions in which water, with some caustic or destructive material added, was the principal solvent. Carmine of commerce, it is true, is not readily soluble, even in water, until ammonia, borax, or some other aid to solution is added ; but carminic acid, the basis of the coloring matter of carmine, has long been stated, in the leading chemical dictionaries and handbooks, to be readily soluble in water and in alcohol. Watts (Diet. Chem.,...
Página 128 - 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 128 - They appear as particles so minute that when laid upon a windrow and forming an apparent line they cannot be separated under the microscope, (c) They take the form of filaments when the glass is sufficiently tough for them to be maintained unbroken, (d) They take a circular form. I regret that three of the most striking specimens were broken in mounting. In one, a perfect line about...
Página 317 - ... superposed, zinc white or some similar cement is run round it, and the preparation is complete. In process of time the glycerine will permeate the gelatine and convert it into glycerine jelly ; if this does not take place soon enough, it may be hastened by placing it in an oven kept at a temperature of about 20° to 30° C.
Página 474 - Cupric and other salts, used as above described, have not given me very favorable results. Sometimes salts in the tissues of the animals themselves change portions of the carminic acid to purple carminates, giving a double coloration without further treatment. Picric acid added to alcoholic carminic acid in extremely small quantities (best in a dilute alcoholic solution, testing the solution on specimens after each addition) makes a double alcoholic coloring fluid (a so-called picro-carmine).
Página 313 - To 600°™ of melted gelatine add first 240ccm of a saturated solution of oxalic acid, then 240ccm of a cold saturated solution of red prussiate of potash (potassic ferricyanide). 3. No. 1 poured slowly into No. 2 while stirring vigorously ; the mixture heated for fifteen minutes. 4. After cooling, the emulsion is pressed through netting, the vermicelli washed and spread on waxed paper for drying. In this case the vermicelli must be dried directly, as they do not melt well without the addition of...
Página 312 - ... until liquified ; and then add to it, little by little, one litre of a strong solution of carmine in ammonia.* The mixture, stiffened by cooling, is cut up, and the pieces packed in a fine piece of netting. Vigorous pressure with the hand under water forces the emulsion through the net in the form of fine strings or vermicelli. These strings are placed in a sieve, and washed until they are free from acid or excess of ammonia, then collected, and re-dissolved by heating. The liquid is poured upon...
Página 127 - By grinding this split face, a knife-edge is formed against the natural face of the diamond, which will remain in good condition for a long time. When a ruling crystal has been found which will produce moderately heavy lines of the finest quality, it is at first generally too sharp for ruling lines finer than 20,000 or 30,000 to the inch, even with the lightest possible pressure of the surface of the glass.