56 On the Colour of tlie Atmosphere and Deep Water, 



with nodules of obsidian, is observed, at about one and a half miles 

 from the village of La Carbonera. The tertiary tract terminates 

 at C, the Sien-a de Cabrera. 



Section 13. is sufficiently explained in the memoir. 



Sections 14. and 15. The latter is the prolongation of the former be- 

 yond Vera. A is the little group of mammelonated pitchstone 

 h^h, near the line of road from La Garrucha to Vera. B that 

 part of the road where there is a semblance of alternation between 

 sandstone strata and pitchstone. 



Section 16* Jlepresents the fissure or dry valley, which forms a com- 

 munication between the open tract near Vera and the plain of 

 Locca. The mountains on the right descend to the Mediterra- 

 nean shore, some four or five miles distant, and in the border they 

 ' form to the valley, is seen the little group of trachytic hills al- 

 '• luded to between Vera and Pulpi. 



ON THE COLOUR OF THE ATMOSPHERE AND DEEP WATER. By 



the Count X AVI ER DE Maistre. ( Concluded from former 

 Volume, p. 359.) 

 It is requisite, in the first place, that the vein be sufficiently 

 deep to absorb all the light transmitted by the skin, and that 

 the latter should be of that degree of fineness necessary to trans- 

 mit a great part of the light. If the vein is small, it reflects the 

 colour of the blood, and becomes red * ; and this colour, mingling 

 with the opaline blue of the skin, forms those violet tints ob- 

 served on the countenances of many persons. If the vein be 

 still smaller, and lying nearer the epidermis, the transparency of 

 the skin increases, and the red colour is fresher. Finally, a 

 tissue of imperceptible veins, placed very near the surface of the 

 ikinj' colours the lips and cheeks of young persons having a 

 fine complexion, with a uniform tint of red ; but, it ma}'^ be ob- 

 served, that these fine colours are not exactly of the same tint as 

 "ihe blood which produces them ; they are mingled with the opa- 

 line blue, which renders the colour slightly carmine, sometimes 

 inclining to purple and violet on the lips of persons of a sangui- 

 'neous temperament. 



Thus the differences in the size of the bloodvessels, and in 



jjjj, * It is in this way that the lube of a barometer of large size, and full of 

 .jf^d-coloured liquid, appears black, while a tube of small (Umensions, filled 

 with the 8&me liquid, is of a fine purple. 



