88 



Mr. C. J. Lundstrom. 



where the percentage of phosphorus in the metal is small, ought not 

 then to be considered as too bold a presumption. 



The Lithium Spectrum. 



Lia (X = 6705) lis found in every spectrum. Besides Li/3 (X = 6102 

 according to Thalen, X = 6098 according to Huggins*) may be con- 

 sidered as agreeing with the sharp line 6097 in Watts' Bessemer 

 spectrum, and the band 6106 in Hagfors spectrum, and possibly it 

 may form part of the band 6106 — 6079 in the Nykroppa spectrum. 



The Potassium Spectrum. 



A spectrum produced by means of a potassium salt in the electric 

 spark gives a line spectrum, which, according to the measurements 

 made by Lecoq, chiefly consists of the groups a, with X = 5831 — 

 5801—5783, /3 with X = 5355— 5336--5319 and, 7 with X = 

 6946 — 6913. At Nykroppa 7 has been observed at least once. It 

 may, therefore, be admitted as something quite certain that the 

 groups in the Nykroppa and Hagfors spectra, 5832 — 5797 — 5774 

 and 5338 — 5318, are derived from potassium, and likewise possibly 

 the lines 5823 and 5781 in the Langsbytte spectrum. 



The Calcium Oxide Spectrum. 



Of this spectrum Lecoq has fine drawings and careful measure- 

 ments. The most important bands are a with X = 6265 — 6202 — 6181, 

 /3 with X = 5543—5517, and 7 with X = 5933. 



With traces of CaO on a platinum wire, heated in a Bunsen flame, 

 there will appear only the two first bands faintly, and of these /i 

 remains longest. I heated MnCl 2 , together with traces of CaCl 2 , on 

 a platinum wire in a gasoline lamp, and then observed the red band 

 6277 — 6179, and faintly the band 5532, as well also the Mn 2 O s 

 spectrum which was observed in the Hagfors spectrum. Likewise, I 

 obtained with a larger quantity of CaCl 2 , and a smaller proportion of 

 MnCl 2 , quite that spectrum which appeared before the " blow " at 

 Hagfors, and in which CaO/3 appears distinctly, and CaO y appears 

 faintly; the band 5532, and the appearance of the band 6255 — 6211 

 in the Nykroppa spectrum might also be due to traces of CaO. 



The Magnesium Spectrum. 



Another explanation of the band 5532 in the Nykroppa and Hag- 

 fors spectra, which also should explain the line 5712, is given by 



* See Kayser, ' Lelirbuch der Spectralanalyse,' p. 290. 



