98 J. N. Lockyer on the supposed Compound 
by itself competent to form a compound body f by union with — 
itself or with something else when the temperature is lowe | 
Then we may imagine a furnace B in which this compound — 
body exists alone. The spectrum of the compound f would be — 
the only one visible in B, as the spectrum of the assumed 
elementary body a would be the only one visible in A. 
sss | 
Mic 
os Se | 
iim 
iii = — 
“ : 
Fig. : 
A lower temperature furnace C will provide us with a more — 
Sapa substance 7, and the same considerations will hold — 
00 
‘ Now if into the furnace A we throw some of this doubly — 
compound body 7 we shall get at first an integration of the — 
three spectra to which T have drawn attention; the lines of 7 
will first be thickest, then those of 8, and finally a would exist 
alone, and the spectrum would be reduced to one of the utmost 
simplicity. 
Gunn Queue Wows & 
This is not the only conclusion to be drawn from these con: 
siderations. Although we have by hypothesis f, 7 and a, all : 
higher, that is, more compound forms of a, and although th 
strong lines in the diagram may represent the true spectl™ 
