The Microscopist; Or, A Complete Manual on the Use of the Microscope ...Lindsay and Blakiston, 1852 - 191 pages |
Common terms and phrases
acetic acetic acid achromatic ammonia angles angular aperture animal animalculæ appearance beam blood body Canada balsam capillaries cells cellular tissue central vesicle chloroform coagulated colouring matter composed compound consists Contains corpuscles covered crystals cules delicate diameters dissection epithelium ether examined exhibit eye-piece fibres focal length focus globules granules hair high powers hydrochloric acid illoricated illumination inch infusoria injection instrument lacunæ larger larvæ lens lenses lime loricated maceration ments microscope minute mounted dry mounted in balsam mounted in fluid mucous membrane mucus nerves nitric acid nuclei nucleoli object-glass observed opaque objects organic ounces oxalate particles phosphate piece plano-convex lens plate polarized light potash prepared prism rays round salt scales sections seen slide slip of glass smallest molecules soluble solution striæ structure substance surface swell test objects thin glass tion transparent objects tube tumour urate uric acid urine vessels viewed white globules yellow
Popular passages
Page 162 - ... body, or transmit it through a thin plate of either of them, it will be reflected and transmitted in the very same manner and with the same intensity, whether the surface of the body is held above or below the beam, or on the right side or left, or on any other side of it, provided that in all these cases it falls upon the surface in the same manner ; or, what amounts to the same thing, the beam of solar light has the same properties on all its sides ; and this is true, whether it is white light...
Page 77 - Canadian bnlsam, and hold it over a lamp until it becomes slightly fluid without froth. A preparation thus made seldom fails, and when magnified 300 times in diameter, we see that the mass of the chalk is chiefly composed of minute well-preserved organisms. In this preparation, all the cells of the...
Page 122 - Compound membranes j composed of simple membrane, and a layer of cells, of various forms (epithelium and epidermis) ; or of areolar tissue and epithelium ; as mucous membrane, skin, secreting glands, serous and synovial membranes. 6. Simple isolated cells, forming solid tissues by their aggregation ; as fat cells, the vesicles of gray nervous matter, absorbent cells of the villi, and the cellular parenchyma of the spleen. In these cases the cells are held together by the bloodvessels and areolar...
Page 36 - Huygenian eye-pieces, d, df, d'1 ', of successive powers. The erecting glasses, y, are to be screwed, when employed, into the other end of the sliding tube. They rectify the image, which is inverted when seen in the usual way. Their chief advantage is in microscopic dissection. The stage has two steady rackwork motions, at right angles to each other and to the axis of the body, given by the milledheads, e, e...
Page 51 - ... be in the axis of the microscope. For obscure objects, seen by transmitted light, and for outline, a full central illumination is commonly best; but for seeing delicate lines, like those on the scales of insects, it should be made to fall obliquely, and in a direction at right angles to the lines to be viewed. " The diaphragm is often of great use in modifying the light, and stopping such rays as would confuse the image (especially with low or moderate powers), but many cases occur when the effects...
Page 139 - Saturated solution of bichromate of potash, 8 fluid ounces; water, 8 ounces; gelatine, 2 ounces. Saturated solution of acetate of lead, 8 fluid ounces; water, 8 ounces; gelatine, 2 ounces.
Page 77 - A great number of infusorial earths may be mounted in balsam (test objects dry, however,) without washing, &c., but others must be repeatedly washed or digested in acid. For the skeletons or shields in carbonate of lime, Professor Ehrenberg has directed to place a drop of water on the slide, and put into it as much scraped chalk as will cover the fine point of a knife, spreading it out, and leaving it to rest a few seconds; then withdraw the finest particles, which are suspended in the water, together...
Page 49 - ... excepting what is transmitted through or reflected from the object. . 2. Delicate observations should not be made when the fluid which lubricates the cornea is in a viscid state. 3. The best position for microscopical observations is when the observer is lying horizontally, on his back.
Page 140 - ... to recognise one preparation from another, until the operator's eye be educated to the effects of this chemicogelatinous injection. Where so much wet abounds gummed paper is apt to come off. " When dry, it is sufficient for the purpose of brief examination by the microscope, to wet the surface of a preparation, with clean oil of turpentine ; immediately after examination, it should be put away carefully in a box, to keep it from the dust, until it can be mounted in Canada balsam. " The bichromate...
Page 165 - Iceland spar of one-fourth of an inch in length, and about four-eighths of an inch in breadth and thickness, is divided into two equal portions in a plane, passing through the acute lateral angle, and nearly touching the obtuse solid angle. The sectional plane of each of these halves must be carefully polished, and the portions cemented firmly with Canada balsam, so as to form a rhomb similar to what it was before its division ; by this management the ordinary and extraordinary rays are...