202 Tenth Supplement to Dana's Mineralogy, 



needle, which is attentively regarded. The open aperture now 

 assumes a lustrous appearance, and one is tempted to believe 

 that it encloses a plate of very clear polished glass; but as an 

 instinctive search for minute particles of dust on this imaginary 

 surface fails to detect them, the idea is gradually forced on the 

 mind that it is the air itself which now has become lustrous. By 

 shading the black paper the effect is much heightened. Corres- 

 ponding effects are- produced by the use of blue with yellow 



Dove suggests,* that the peculiar lustre of the deep blue sky 

 is caused by light from different distances falling on the eye; 

 and I found, in fact, in this experiment, that when a surface of 

 dark blue pnper is combined with white or light blue paper, the 

 combination strongly reminded me of the soft lustre of a cloud- 

 Troy, N. Y., August, 1362. 



Art. XIX.— Ten ^A Supplement to Dana's Mineralogy; by Geo. 



J. Bkush, Professor of Metallurgy in Yale College. 



List of Works, etc. 



A. Kenngott : Uebersicht der Resultate mineralogischer Forschungen im Jaii" 



1860. 8vo,pp. 217. Leipzig, 1862. 



H. Kopp UND H. Will: Jahresbericht iiber die Fortschritte der Cliemie, und 



verwandter Theile anderer Wissenschaften. 8vo, pp. 906. Giessen, 1861. 

 H. Gieard: Handbuch der Mineralogie. Svo, pp. 656. Leipzig, 1862. 

 F. V. Kobell: Die Mineralogie— Populare Vortrage. Frankfurt a. M. 1862- 

 H. 0. Lknz: Mineralogie der alten Griechen und Romer. Svo, pp. 194. Gotha, 

 Feikderich Hessenbebg : Mineralogische Notizen, No. 4. Dritte Fortsetzun?- 



figures and descriptions of crystals of Gypsum from Girgenti; Calcite from Ble'- 



berg. Maderaner-Thal and Abrnlhal; Apatite, Spliene and Perowskite from PM^'" 



in Tyrol; American Chrysoberyl ; Datholite from Bergen Hill; Hnytoiite; F«h'»''; 



from Kahl; Barytea from Ober Ostern ; Brucite from Texas, Pennsylvania; OrtB 



Zuverlassigk 



eit (22. Rothbleierz). 8v^,. pp.'sS. mit 12 Tafel^. 



Wien 1860. 





F.: Mineralogische Notizen. L Ein Beitrag zur Entw 



£s^:St 





nd^des Malachites von Moldava im Banat. II, U 







neen-Neues h)^' | 



buch fiir Mir 



eralogie, etc., Jahrgang, 1861, pp. 278-285, 4.S4-45 



S, 655-666. 









der vV.ssen=^ 



aus^der Umgegend von Retzbanya. SitzuDgsbericb 

 Iiatten, xliii, 385-463, xiiv, 81-187. 



ir'rS 



Cla.ee Deville: De la pr6,ence du Vanadium 



u muli de la France. Etudes analytiques 8ur les ma 

 me et de Physique, (3.) ki, 309. ^ ^ 







»Pogg.Aimalen,yoLcxiT,p.l67. 





