292 On the Serpentinite of the Lizard. 



roxene, partly restored. It has the colour, lustre, and cleavage of 

 ordinary chlorite. Slightly magnified. 



Fig. 2. Transverse section of a similar crystal, showing its lamellar or 

 cleavage structure. Slightly magnified. 



Fig. 3. Vein of chrysotile composed of three layers : a, chrysotile in the 

 incipient stage, i. e. green serpentine slightly fibrous ; 6, in the fully 

 developed or asbestiform condition ; c, a layer altered to such an extent 

 that its structure is nearly destroyed ; it is divided in the middle by a 

 film of calcite. Magnified 37 diameters. 



Fig. 4. Bands of serpentine differently coloured. Slightly magnified. 



Kg. 5. Configurations shaped like the figure 7, consisting of saponite in a 

 granular condition, and consequently of a white colour. They are 

 ridges imbedded in calcite, but rising above the surface of the matrix 

 in consequence of its being partially dissolved. 



Fig. 6. A mass of mineral provisionally identified with tremolite, having 

 one side (right) removed, as shown by the band a (everywhere 

 else seen) being absent. This case may be regarded as proving that 

 the calcite occupying the place of the absent band has replaced the 

 tremolite which composed it. The white diverging lines are much 

 finer, and more numerous than are represented in the figure. Mag- 

 nified 37 diameters. 



Fig. 7. A vein of dolomite in three structural conditions — indefinitely 

 fibrous, prismatic, and with rhombohedral cleavage. Slightly magnified. ' 



Fig. 8. Piece of tremolite enclosing two cylindrical rods (seen on their 

 transverse section) ; their interior is composed of saponite, and their 

 exterior of serpentine. Through an oversight, the exterior has not 

 been coloured green in the figure. Magnified 37 diameters. 



Fig. 9. Piece of tremolite enclosing four cylindrical rods composed of ser- 

 pentine. Magnified 37 diameters. 



Fig. 10. One cylindrical rod composed of both white-granular and green 

 serpentine, and another apparently with all its serpentine in the white- 

 granular condition. Both are fixed in calcite. The serpentine in 

 the centre of the upper figure is in a granular or flocculent state, and 

 ought to have been coloured white. Magnified 37 diameters. 



Fig. 11. Piece of tremolite enclosing four cylindrical rods composed of cal- 

 cite : they are now represented by empty spaces, in consequence of 

 their component mineral being dissolved out. Magnified 37 diameters. 



Fig. 12. Fissure-like opening in saponite containing calcite : the saponite 

 on one side of the opening is in the acicular condition. The aciculae, 

 some separated and others in contact, projected into the calcite before 

 it was dissolved out. Magnified 37 diameters. 



Fig. 13. Cavity in saponite containing calcite, in which is imbedded a 

 dendroidal configuration composed of white granular saponite. The 

 configuration, which is attached by its right extremity, rises above the 

 surface of the calcite through the partial removal of the latter mineral 

 by decalcification. Magnified 37 diameters. 



Fig. 14. Cluster of spherical bodies (resembling ova) composed of white 

 granular saponite, and imbedded in calcite : some are above the sur- 

 face of this mineral ; others, faintly seen and isolated, are imbedded 

 in it. Magnified 37 diameters. 



Fig. 15. Vermiform and other bodies imbedded in saponite; some are 

 translucent, others white opaque, and a few are in both conditions. 

 Slightly magnified. 



Fig. 16. Vermiform and other bodies composed of serpentine and im- 

 bedded in saponite. Slightly magnified. 



Fig. 17. Transverse section of a mass of Ste?iopora-like tubulation formed 



