File:The American Museum journal (c1900-(1918)) (17975040789).jpg

Title: The American Museum journal
Identifier: americanmuseumjo15amer (find matches)
Year: [1918 c1900-[1918]] (c190s)
Authors: American Museum of Natural History
Subjects: Natural history
Publisher: New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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ANIMALS OF BLOWN GLASS -401 cleus, vacuoles and chromatophores, are fashioned separately from small tubes or solid rods of colored glass and fast- ened within the cup. The nucleus is blown from a small green glass tube into a hollow ball about one-quarter inch in diameter. One end is cut open for inserting the nucleolus which has been previously shaped from a green rod into a little solid bead. This is of a darker color than the tube used for the nucleus. To the solid bead, or the nucleolus, a short glass stem is attached by which it is to be supported within the hollow ball. When the nucleolus is in- serted into the ball, a little spot of the shell of this ball is heated and the sup- port of the nucleolus is fused to the wall of this shell. Then the opening of the shell is covered with enough hot glass to close it, and the nucleus is completed. The vacuoles are blown in the same manner as the nucleus, only they are of crystal glass and consist of only one shell. Nucleus and vacuoles have little stems attached to them by which they are fastened in the cup. The supports are placed where they will show least. After all the parts are ready to be inserted in the cup, one after the other, they are held in place by the forceps, a small area of the outer wall of the cup is heated and the supports of the parts are fused to the inner cup wall. When this is done, the cup is closed by heating the glass around the rim opening and draw- ing it together until a rough closing is obtained. The superfluous glass which forms in this manipulation, is pulled 1 Radiolaria are tiny, one-celled animals which possess the faculty of extracting silica from sea water and forming with it skeletal structures to protect their soft, jelly-like body. They are found in both fresh and salt water, particularly the latter, and are usually microscopic, but giants among them may attain the size of a pin's head. There may be very many in a single drop of sea water, especially in the warmer seas, and they exhibit great variety of form
Text Appearing After Image:
Early stage in the modeUng of a simple radio- larian i away little by little, and the resulting unevenness of the surface is smoothed out by reheating the closed portion and blowing several times through the hoi-

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