PLATE XVI. 
Fic. 1. Soda-granite, from Titus’ Mill. The feldspar is stippled, the fine 
twinning of the anorthoclase, being represented where visible by 
parallel lines. Some attempt is made to show the comparative 
alteration of the feldspar by the heaviness of the stippling. Horn- 
blende is represented by diagonally crossing parallel lines. Quartz 
is unshaded and magnetite is dead black. Spec. 661. > 18 diam. 
Fia. 2. Soda-granite fine grained and porphyritic. From the Hammond 
River below Upham. Shading as in the last figure, but augite 
is represented by irregular lines. Spec. 666. XX 37 diam. 
