1894.] Petrography. 601 
PETROGRAPY: 
Contact Effects around Saxon Granites.— The effects of the 
granite and syenite of Lausitz, of the granitite of Markersbach and of 
the tourmaline granite of Gottleube upon the rocks through which 
they cut in the Elbthalgebirge in Saxony, are concisely described by 
Beck? The members of the phyllite formation and the beds of Cam- 
brian, Silurian and Devonian age, whatever may have been their 
nature, have all undergone contact metamorphisen near ther junction 
with the eruptives. During the process of altergtion there seems to 
have been little addition of material to the metamorphosed rocks, as 
all the contact products when originating from the same member of 
the bedded series are the same, irrespective of the nature of the meta- 
morphising eruptive. The great variety in the contact products of the 
region is due solely to differences in the character of the originals of 
the altered rocks. The phyllites have been changed to ‘Fruchtshiefer’ 
and into andalusite mica schists, chlorite gneisses into biotite gneiss, 
and feldspathic quartzites into hornfels. The Silurian slates near 
the contacts have become hornstones and knotty schists, carbonaceous 
quartz schists have changed into graphitic quartzites, graywackes and 
marbles have been made crystalline, and the latter rock has in many 
cases been changed into a cale-silicate aggregate, which has been 
impregnated with ore masses, presumably originally in the granitite 
with which the limestones were in contact. Diabases and diabase 
tuffs in proximity to the intrusive rocks have been amphibolized. The 
Devonian rocks have suffered the same alterations as the corresponding 
Silurian ones, and in addition there has been formed a gneiss-like rock 
whose predecessor among the clastics is unknown. A large number of 
contact minerals are discussed at length by the author, chief among 
them being quartz, plagioclase, cardierite and graphite. The article is 
full of instructive suggestions though nothing of striking novelty is 
met with in it. 
The Schists of the Malvern Hills.—Callaway? has published 
a final summary of the conclusions based on seven years work in the 
Malvern Hills. He reiterates his belief that the schists of the region 
'Edited by Dr. W. S. Bayley, roped University, Waterville, Me. 
?Min. u. Petrog. Mitth. XIII, p 
*Quart. Jour. Geol. Soc., Xr p p. 398. 
