. A general history of animalcules, including their appearances and localities and the methods of capturing, viewing and preserving them. home, and place the vesselsupright; for which a mahogany stand, furnished with anumber of holes adapted for the vessels, will be veryconvenient. A gauze covering, fitted to the frame, willkeep out the dust and blacks, without obstructing the freeingress of air. We now proceed to the mode of investigating theseminute creatures under the microscope. If the kind to beexamined are those which swim freely, and are visible tothe naked eye, as the Volvox, Bursaria,
. A general history of animalcules, including their appearances and localities and the methods of capturing, viewing and preserving them. home, and place the vesselsupright; for which a mahogany stand, furnished with anumber of holes adapted for the vessels, will be veryconvenient. A gauze covering, fitted to the frame, willkeep out the dust and blacks, without obstructing the freeingress of air. We now proceed to the mode of investigating theseminute creatures under the microscope. If the kind to beexamined are those which swim freely, and are visible tothe naked eye, as the Volvox, Bursaria, and other largePolygastrica, and also the free Rotatoria, take a small openglass tube, such as is described in the Microscopic Ca-binet, p. 236, and select the specimens withit in the manner there recommended. Thefigure of the tube I here insert from thatwork. The diameters of these tubes mayvary from one-eighth to one-twelfth of aninch, and their length from four to six may be useful occasionally to draw out andslightly bend the extremities which are to beimmersed in the water. When the creatures are more minute than ^^. 28 GENERAL HISTORY OF those above mentioned, pour a little water from the vesselcontaining them into a watch glass, and place it upon apiece of cardboard, rendered half black and half white ground will make the dark specimens apparent,and vice versa; thus, the required specimens may be takenout singly with one of the tubes, and placed in the aquaticlive-box for observation. The observer will derive muchassistance in this operation from the use of the pocket-magnifier before mentioned, or from a watchmakers eye-glass. When the Infusoria are extremely minute, they usuallycongregate at the edge of the water over the white portionof the cardboard, and may be removed from thence withthe point of a quill, or of a small wedge-shaped a quantity of the Chara, or other aquatic plants, be putinto a glass jar with the Infusoria, in the cours
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Keywords: ., bookcentury1800, bookdecade1850, bookidgeneralhisto, bookyear1851
