432 Miscellaneous Intelligence. 
in certain aspects and under certain incidences of light, exhibits an 
This color was 
extremely vivid and beautiful celestial blue color. 
shown by Sir John Herschel to result from the action of the strata 
appearance the same as before its entrance ; nevertheless, it was found 
to have undergone some mysterious modification,—for an epipolized 
i ad on 
by a series of simple and perfectly decisive experiments ; showing that 
it is in fact the chemical rays of the spectrum, more refrangible than 
the violet, and invisible in themselves, which produce the blue superfi- 
cial light in the quiniferous solution. . Prof. Stokes has-traced this prin- 
‘* true internal dispersion,” or “ fluorescence,” as it is termed by Prof. 
