ANIMALS OF BLOWN GLASS 
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. 
darker color than the tube used for the 
nucleus. To the solid bead, 
nucleolus, a short glass stem is attached 
This is of a 
or the 
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 
401 
Early stage in the modeling of a simple radio- 
larian ! 
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 hol- 
