in the Invisible Prismatic Spectrum. 183 
Lines known. to previous Investigators. 
0 
sah Possibly corresponds to Draper’s /. 
1:26.) Inconspicuous line. 
(1°35-37.) Very remarkable band. Almost absolutely cold and 
black. So broad and diffuse that it is difficult to mark its limits, 
Tew! observations make it probably of telluric origin.) 
Newly-discovered Lines and Cold Bands. 
(1°55 and 1-59.) Inconspicuous lines. 
(1°81 to 1-87.) Great Cold Band, first discovered on Mount 
Whitney. Probably: of telluric origin. It is not the furthest 
line, but is here called Q. on account of its being the last conspic- 
“ous break in the energy curve. 
(1°98 and 2-04.) Small but definite lines. The last discovered 
by the bolometer. But the observable solar spectrum certainly 
extends to a wave-length of over 2-70 . 
Distribution of Energy in the Normal Spectrum. 
Without an extra-polation, between our p : t 
Points of observation ; a deviation of 50° 58’ (corresponding to 
the degrees of deviation, if represented, would be unequally 
belo entirely independent 
If, besides making a map of the normal spectrum, we — 
to construct a curve representing the corresponding distri a 
trum has, as we have ~ 
