Band and Line Spectra of the same Metallie Elements. 97 
The lines 5548 and 5517 are probably components of an exceedingly strong 
band, extending from 5598 to 5485, but they correspond with two spark lines 
measured by Eder and Valenta. The red band with centre at \ 6223 was not 
photographed on this plate. 
Quantity of 
Calciwn. 
2°45 gr. 
0°50 gr. 
0:50 er. 
Calerwn—The Flame of the Burning Metal. 
Metallic calcium was rolled out into thin sheets, from which slips 
about 8 mms. in width were cut and burnt in the flame of a Mecke 
burner. The flame was focussed on to the slit of the spectrograph. 
Wratten and Wainwright’s panchromatic plates were used. 
Description of the Spectrum photographed. 
The red line of lithium \ 6078, and the yellow lines Na’ and Na’ 
of sodium were visible, but generally the two latter appeared as one 
line. The quantity of hthium could not have exceeded 0-002 gr. 
The red, orange, and green bands of calcium were broad and 
dense. A feeble band of continuous rays extended to a little beyond 
4226-9. The line \ 4226.9 was dense and broadened out near its 
base; it tapered off to a fine point towards the apex of the flame. 
It was the only strong line seen. ‘There was absolutely no trace of 
lines corresponding to the great and intense H and K lines \ 3968-6 
and \ 3933°8, common to the are and condensed spark. The lines 
about 4455, 4435, and 4586 appeared very short and feeble, barely 
visible in fact. 
I. The red, orange, and green bands only appeared, and these 
were feeble. ‘The impurity lines of lithium ani sodium were seen. 
II. Photographed with a finer slit the red, orange, and green 
bands were proved to be composed of fine narrow bands very close 
together. 
III. A bead of calcium chloride was heated in the flame, until all that 
remained was calcium oxide. This was left in the flame of a Mecke burner until 
nothing but a very feeble tinge of red was visible. 
The spectrum consisted of the red band with centre at \ 6223, and the green 
band with centre at \ 5534 of calcium, with the impurity lines of sodium between 
them. The exposure lasted about three hours, during which time the substance 
in the flame was not renewed. 
