MR. 0. A. DERBY ON NRPnELEyE-ROCKS IX BRAZIL. 



201 



Fig. 3. 



Group of pseudo-crystals in foyaite, reduced 7 diameters. 



Fig. 4. 





Dyke of phonolite with pseudo-crystals in foyaite ' 



* The foyaite to tlie left has been blasted away, exposing a part of the lateral 

 face of the dyke in the upper part of the figure. 



Q. J. G. S. No. 186. _ T 



