440 J. D. Dana on some points in Lithology. 
hence to be understood as covering orthoclase, microcline and 
leucite ; and soda-lime feldspar, as including the triclinic feld- 
= from anorthite to albite, and also nephelite, sodalite and 
the saussurites, 
The arrangement is as follows. In the first series, the rocks 
graduate into kinds which are all feldspar, and into others that 
are all mica; and yet the amount of potash present is approxl- 
mately the same. j 
I. Toe Mica anp Potash FeLpsPaAR SERIES: including 
Granite, Granulyte, Gneiss, Protogine, Mica schist, etc., Fel- 
syte, Trachyte, etc., and the Leucite rock of Wyoming. © 
IL Tae Mica anp Sopa-Lime Fexpspar Series: includ- 
ing Kersantite, Kinzigite; and the nephelitic kinds Miascyte, 
Ditroyte, Phonolyte, ete. (These nephelitic kinds belong 
almost as well in the preceding series 
. THe HoRNBLENDE AND PoTasH FELDSPAR SERIES: 
including Syenyte (with Quartz-syenyte), Syenyte-gneiss, Horn- 
lende schist, Amphibolyte, Unakyte (this last containing epl- 
dote in place of hornblende); and the nephelitic species Zircon- 
Syenyte, Foyayte. 
IV. THe HornBLeNpdE AND Sopa-Limz FELDSPAR SERIES: 
including Dioryte (with Propylyte), Andesyte, Labradioryte (or 
Labrador-dioryte), etc., and the saussurite rock, Euphotide. 
» V. Tue PyRoxene AND Porasu FELDSPAR SERI&S: includ- 
ep eae 
I. Tae PyroxENE AND Sopa-Lime FELpspAR SERIES: 
including Augite-Andesyte, Noryte(Hypersthenyte and Gabbro 
in part), Hypersthenyte (containing true hypersthene), Doleryte 
nek gee Basalt and Diabase), Nephelinyte, ete. 
VII. Prroxene, GARNET, EPrpoTE AND CHRYSOLITE ROCKS, 
CONTAINING LITTLE OR NO FeLpspar: including Pyroxenyte, 
Lherzolyte, Garnetyte (Garnet rock), Eclogyte, Epidosyte, 
Chrysolyte or Dunyte (Chrysolite rock), ete. 
I. Hyprovs MaGnestan AND ALUMINOUS Rocks, CON- 
TAINING LITTLE OR NO FetpspaR: including Chlorite schist, 
Talcose schist, Serpentine, Ophiolyte, Pyrophyllite schist, etc. 
