“ 
eee 
92 Phenomena of Polarized Light. 
with a lancet point and stripping it off, and thus we have a new 
color for the whole figure differing from the ground-work, and 
we may now proceed to trace all the details, by cutting in toa 
greater or less depth and detaching 3. 
the films by the lancet point, and hay- 
ing a polarizing mirror before us and 
a Nicols prism, we can in a few hours 
complete a work which will vie in 
splendor with many of the selenite 
specimens that occupy many weeks in 
construction. The pieces when fin- 
occupied me more than five hours, yet they are truly splendid 
objects when magnified upon a screen. These illustrations will 
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serve as models for any one to work upon, and although seem- 
ingly difficult, yet even an unpracticed hand cannot fail to bring 
out something gratifying. In the figures of the peacock and 
chameleon, I took the liberty of coloring the trunk of the tree 
with the brush, which adds much to the picture. 
Washington, November 12, 1850. 
