GEOLOGY AND PETROGRAPHY OF THE PRuSPECT INTRUSION. 553 



Plate XXXV. 

 The central portion of the main face of the Reservoir Quarry. 



Plate XXXVI. 

 Southern end of the Reservoir Quarry looking south-east, show- 

 ing the two large segregation veins dipping toward the main face 

 of the quarry. 



Plate XXXVII. 

 Portion of the upper segregation vein. 



Plate XXXVI II. 

 Portion of the lower segregation vein. 



Plate XXXIX. 

 Fig. 1. Micro-Section of pallio-essexite with included grain of 

 quartz. 



,, 2. Micro-Section of pallio-essexite showiug a phenocryst of 

 olivine. 



,, 3. Micro-Section of essexite. The clear white mineral in the 

 centre of the slide is analcite. The partly decomposed 

 white mineral is plagioclase, and the dark crystals at 

 the left are augite. 



,, 4 Micro-Section of essexite much decomposed with idiomor- 

 phic crystals of analcite and much chlorite. 



,, 5. Crystal of labradorite from essexo-pegmatite, between 

 crossed nicols, showing alteration along cracks and 

 cleavages into isotropic analcite. 



,, 6. Micro-Section of essexo-aplite showing idiomorphic felspars. 

 The dark colored material is chlorite. 



Plate XL. 

 Specimen of fine-grained aplite with a vein of coarser aplite* 

 (About natural size.) 



