ON THE MEASUREMENTS OF WAVE-LENGTHS. 
125 
The Spectrum of Arsenic (continued). 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
160'80 
Weak, continuous, nebulous, weak in 
1 
centre. 
2981-1 
164-82 
Vert strong, with a nimbus, discon- 
tinuous. 
2958-7 
170-67 
Weak, discontinuous. 
2925-6 
175-75 
Strong, continuous, extended . . . 
2898-2 
177-22 
J Weak, continuous, faint in centre . 
2889-1 
178-40 
(_ Weak, continuous. 
2884-2 
183-04 
Vert strong, extended, continuous 
2859-7 
»The strong lines here form a 
185-37 
Faint, discontinuous. 
2843-6 
characteristic group. 
187-01 
Faint, discontinuous. 
2836-9 
188-81 
Strong, continuous, nebulous . . . 
2829-8 
196-93 
Faint, discontinuous. 
2788-5 
199-22 
["Vert strong, continuous, extended, 
J with a nimbus. 
2779-5 
201-07 
| Faint, discontinuous. 
2770-4 
206-77 
I^Vert strong, continuous, extended 
2744-1 
218-85 
Faint, discontinuous. 
2690-5 
222-01 
Faint, discontinuous. 
26770 
222-80 
Faint, discontinuous. 
2673-8 
223-79 
Faint, discontinuous. 
2669-5 
225-10 
Faint, discontinuous. 
2663-5 
228-14 
Faint, fine, discontinuous . '. 
2651-5 
233-33 
Faint, fine, discontinuous. 
2630-2 
238-14 
Faint, fine, discontinuous. 
2611-2 
240-68 
f Strong, continuous, nebulous .... 
2600-8 
241-67 
Weak, fine, continuous. 
2597-1 
241-96 
Faint, continuous. 
2593-9 
247-90 
/ Faint, discontinuous. 
2576-0 
248-38 
Faint, discontinuous. 
2571-6 
250-98 
Weak, discontinuous. 
2559-5 
260-37 
f Strong, continuous. 
2527-9 
265-68 
\ Strong, continuous. 
2526-0 
269-02 
Weak, continuous. 
2496-9 
270-65 
j Strong, continuous, extended . . . 
2491-9 
271-28 
| Weak, discontinuous. 
2489-1 
278-92 
C Weak, continuous, nebulous, faint in 
J centre . 
2464-1 
279-94 
] Weak, continuous, nebulous, faint in 
centre. 
2461-0 
281-58 
Strong, continuous, extended, sharp . 
2456-2 
287-58 
Strong, continuous, extended, sharp . 
2436-9 
287-93 
Weak, nebulous, discontinuous . . 
2435-0 
288-65 
Weak, continuous, fine. 
2432-5 
293-89 
Weak, very short, nebulous .... 
2415-8 
297-52 
f Weak, short, nebulous. 
2403-4 
297-82 
\ Weak, short, nebulous. 
2402-6 
305-77 
, r Strong, continuous. 
2381-0 
*\ 
309-32 
< Strong, continuous, with a nimbus 
2370-8 
309-74 
[_ Strong, continuous, with a nimbus 
2369-7 
311-99 
Weak, continuous, fine. 
2362-8 
316-60 
TVert strong, continuous, extended, 
These strong lines form a charac- 
< with a nimbus. 
2350-1 
teristic group. 
318-66 
Strong, continuous, extended, sharp . 
2344-3 
330-40 
Weak, continuous, fine. 
2320-7 
339-14 
Vert strong, nebulous, with a nimbus, 
and slightly nebulous, extended . 
2288-9 
