104 J. N. Lockyer on the supposed Compound 
making their appearance as the result of partial dissociation, 
we have, by hypothesis, an element behaving like a compound 
If the hypothesis be true, we ought to be able not only to 
obtain, with lower temperatures, a still greater preponderance 
of the single line, as we do; but with higher temperatures, a 
still greater preponderance of the double ones, as we do. 
I tested this in the following manner: Employing photogra- 
phy, because the visibility of the more refrangible lines is 
small, and because a permanent record of an experiment, free 
as it must be from all bias, is a very precious thing. 
nduced currents of electricity were employed in order that 
all the photographic results might be comparable. 
‘o represent the lowest temperature I used a small induction 
coii and a Leyden jar only just large enough to secure the 
requsite amount of photographic effect. To represent : 
lower one cup-shaped, and charged with a salt of calcium. 
n the figure I give exact copies of the results obtained. It 
will be seen that with the lowest temperature only the single 
line (2) and with the highest temperature only the two more 
refrangible lines (6) are recorded on the plate. ; 
This proved that the intensity of the vibrations was quite 
changed in the two experiments. 
Perhaps it may not be superfluous here to state the reasons 
which induced me to search for further evidence in the stars. 
more atomic condition of the same thing, or whether we actually 
break it up into X+y, because neither x nor ¥ will ever vay 
