350 G. Hinrichs on Spectral Lines: 
of the mass. The brilliant capillary points, when more nearly 
examined, seemed identical in size and character with the rhab- 
dite crystals of Reichenbach, so beautifully figured in Prof. 
Rose’s admirable memoir on meteorites,’ as occurring in the 
Braunau meteoric iron. The lens also shows upon the cleavage 
planes of the iron, those peculiar striae which Prof. Rese has 
pointed out as occurring in the Braunau iron; in particalar, 
such as are parallel to the edges and certain diagonals of the 
cube, and which Prestel has shown to be present also in cleavage 
crystals of artificial iron. So far therefore as one sample can 
show, the structural identity of this iron with the interesting 
Braunau mass is very clear. 
The specific gravity, determined by a single experiment, was 
7:50. The solution in nitric acid, when precipitated by ammo- 
continent. Is their preponderance in such regions at all ex- 
plained by the greater impenetrability of the surfaces upon 
which they have fallen? 
Amherst College, Sept. 14, 1866. 
Art. XLVIII.—On the Spectra and Composition of the Elements; 
by Prof. Gusravus Hryricus, Iowa State University. 
$1. Two years ago I communicated to this Journal the re- 
sults of a preliminary investigation of the distribution of the 
dark lines in the spectra of some of the elements, especially the 
spectra of the alkaline earths and iron.’ At that time no exact 
and comprehensive determinations of the wave-lengths corres- 
ponding to these lines had been made; our investigation was 
therefore necessarily based upon Kirchhoff’s arbitrary millime- 
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* Beschrei und Eintheilung der Meteoriten auf grund der Sammlung im 
mineralogischen Museum zu Berlin von Gustav Rose. Berlin, 1364. 
* This Journal, 1864, vol. xxviii, pp. 31-40. 
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