120 T. Sterry Hunt on Granitie Rocks. 
small prisms of apatite are enclosed in large crystals of phiogo- 
pite, in pyroxene, in quartz, and even in massive apatite; 
crystals or rounded crystalline masses of calcite are imbedded 
In apatite and in quartz, and well-defined crystals of hornblende 
m- 
plete, while the space within either remains empty, or is se 
with other minerals, often unsymmetrically arranged. 
well-know? 
granitic veinstone of Paris, Maine. I have elsewhere refer: 
red to the formation of such moulds or skeleton-crystals a 
having taken place in vein-cavities, and as serving to eXP re 
ny cases of enclosure of mineral species (Address to the r: 
A. S., Indianapolis, 1871. Amer. Naturalist, vol. v, page 49))- 
In addition to the examples there cited, the Laurentian vel 
stones afford some curious cases. Thus a prism of ye 
