136 z The American Naturalist. 
The effects upon inclusions of various kinds are discussed 
kne oe son crystalline-schists, inclusions of younger eru 
inclusions of clastic rocks, of sandstone, of quartzite, of basalt- 
and of contact-rocks. Contact-action proper is treated under 
heads: first,the action upon intruded eruptives ; second,upon T 
schists; and third, upon sedimentaries. Endomorphous cont 
is next described, and the articles relative to it are briefly extra 
The action of pressure upon rocks is next taken up, and the discu 
of the changes produced in them by gaseous emanatious conclude 
portion of the volume under review. Practically all the results 
in 
