PETROLOGICAL ABSTRACTS AND REVIEWS Dag 
Skottsberg, Halle, and Quensel, and constitutes the inaugural disserta- 
tion of the latter at the University of Upsala. No attempt was made 
to map the formations in detail, it being thought more desirable to cover 
a greater area with less accuracy. A great number of rocks are described, 
both alkali and alkali-lime, and numerous analyses are given. Among 
the rocks are biotite-monzonite, quartz-monzonite, kentallenite, nord- 
markite, quartz-mica-diorite, tonalite, tonalite-porphyry, biotite-granite, 
bronzite-orthoclase-gabbro, | granite-porphyry, quartz-hypersthene- 
diorite, essexite, essexite-gabbro, quartz-essexite-diabase, comendite- 
granophyre, hornblende-akerite, essexite-porphyrite, camptonite, trachy- 
dolerite, and hypersthene-andesite. 
QUENSEL, P. D. “Die Quarzporphyr- und Porphyroidformation 
in Siidpatagonien und Feuerland,”’ Bull. Inst. Upsala, XII 
(1913), 9-40, figs. 12, analyses. 
QUENSEL, P. D. “The Alkaline Rocks of Almunge,”’ Bull. Geol. 
Inst. Upsala, XII (1914), 129-200, pls. 12, map 1, analyses. 
The alkaline rocks of Almunge represent a deep-seated section of the 
conduit through which magma flowed for some time, as indicated by 
contact metamorphism of the surrounding rocks. The central mass of 
umptekite is surrounded by a rim of aplitic material. Within the main 
body, mostly in the eastern portion, are small areas of nephelite-syenite 
containing a high percentage (7 to 8 per cent) of lime. This lime does not 
enter into the feldspar, which is orthoclase and very sodic plagioclase, 
but is contained in the dark minerals. For this rock the author proposes 
the name canadite. 
RANKIN, G. A. ‘‘The Ternary System CaQ—AI,0;—-SiO,,” Amer. 
Jour. Sci., XX XTX (1915), 1-79, figs. 19. With optical study 
by Fred. E. Wright. 
While numerous papers on the CaO— Al,O,;— SiO. system have been 
published, all of them have been incomplete. This paper contains a 
summary of work performed, and is the first attempt to determine all 
of the compounds, both binary and ternary, in this system. The equi- 
librium diagram representing the stability relations contains 14 fields. A 
list of the compounds obtained, with their crystal system, crystal habits, 
