y.— i. 



SERICITE SCHIST, x 60, 

 MARIWA FALL, CUYUNI RIVER. 



Fhotu hy J. Williai, 



11. 



MUSCOVITE GRANITE, x 12, 



WAINI RIVER. 



{See r.\GE G9.) 



Phofn bi/ J. IJ'ilHams, 



