102 Harttey—An Investigation of the Connexion between 
Weight of 
bariun. 
Fluted bands growing weak, but extending from Ad 5720 to 4420, 
0:0548 gr 
with lines AA 5274, 5180, and 4900. A strong line at d 5536. 
The fluted bands are weak and extend from Ad 5720 to 4640. The 
lines AA 5274, 5180, and 4900 are still visible. 
0:0274 gr. 
Bands very feeble, the lines \\ 5274 and 5180 are hardly visible ; 
O-0164 gr. |) 4900 is feeble. The line \ 5534 is strong. 
The line \ 4900 is very faintly visible, and that at \ 5536 is weak. 
The bands and other two lines have quite disappeared. 
0:0109 gr. Lines AA 4900 and 5536 are barely visible. 
0-008 gr. No trace of the spectrum. 
0:0137 gr 
The line \ 5536, sometimes recorded as 5535, corresponds with 5535°69, a 
strong reversed line in Kayser & Runge’s are-spectrum; it was found by 
de Watteville to be the strongest line both in the flame and the cone when 
the spray was barium chloride solution. It seemed probable that the bands 
of barium chloride might be found in the flame spectrum taken from the chloride, 
but only the very narrow bands or lines, with wave-lengths 5274, 5180, and 4900 
belong to the compound. The first of these is apparently a band corresponding 
to one measured at its centre by Olmsted* at 5242°2; the second with 
one at 5168°9; the third does not appear in Olmsted’s spectrum, the nearest 
approach to it being at \ 5066, which is very weak. 
Spark Spectrum without Condenser. 
This spectrum was not photographed. 
~ 
Description of Spectrum. 
Proportions oF BARIUM IN SOLUTION. 
1-0 per cent. O-l percent. 0°01 percent. 0-001 per cent. 
5535 oe 5535 5585 
5318 2 — — 
5242 eS — —_— 
5136 oF — — 
4932 ws 4932 4932 
Two green lines here; not measured. 
4556 4556 4556 — 
* “Die Bandenspektra nahe verwandter Verbindungen.” Charles Morgan Olmsted. Zeitschrift f. 
wissenschaftl. Photographie, vol. iv., p. 255, 1906. 
