FORMATION OF LEUCITE IN IGNEOUS ROCKS 395 
ABBREVIATIONS 
AGI S— American Journal of Science (New Haven) 
A.R.G.C.C.G.H.=Annual Report of the Geological Commission of the Cape of Good 
Hope. 
Bull. 237= Pirsson, ‘‘Igneous Rocks of the Highwood Mountains, Montana,’’ 
Bulletin No. 237, U. S. Geological Survey (1905). 
C.R.= Comptes Rendus de l’ Academie des Sciences (Paris). 
[_G:— Journal of Geology (Chicago). 
R.C.R.= Washington, The Roman Comagmatic Region, Carnegie Publica- 
tion No. 57 (1906). 
R.F.= Rosenbusch Festschrift (Stuttgart, 1906). 
R.G.S.N.S.W.= Records of the Geological Survey of New South Wales. 
W.R.T.= Roth’s Tabellen, arranged by Washington. Professional Paper 
No. 28, U. S. Geological Survey (1904). 
W.T.= Washington’s Tables, 1884-1900. Professional Paper No. 14, 
U.S. Geological Survey (1903). 
Nl= leucite present in the norm. 
No= leucite not present in the norm. 
M1= leucite present in the mode. 
Mo= leucite not present in the mode. 
