206 Fretp Museum oF NaturAL History — Greotoey, Vot. III. 
R 
Rang. (Old form of rank.) Division of Order based on the character of the chemical 
bases in the preponderant group of standard minerals. 
S 
Sal. Syllable mnemonic of the silico-aluminous non-ferromagnesian group of 
standard minerals, including quartz, feldspars, lenads, corundum and zircon. 
Salfemane. Class III of igneous rocks; having salic and femic minerals in equal or 

; sal 5 3 
nearly equal proportions. eee < 3 > = 
Salfemic. Having salic and femic minerals in equal or nearly equal amounts. 
S 
sie eh SS. 
Fem 9 5 
Salic. Having the characters of, or belonging to, the first (sal) group of standard 
minerals. 
Section. Subdivision of any of the other taxonomic divisions from Class to Subgrad. 
Subrang. Division of Rang, based on the character of the chemical bases in the 
preponderant mineral subgroup used in forming Rang. 
In order to still further indicate the manner 1n which the calculations 
upon which the place of each meteorite in the classification is based 
are made, two examples of such calculations are here given. The first 
illustrates the calculation of the mineral components which characterize 
the great majority of the stony meteorites, the analysis chosen for the 
calculation being one of the Allegan meteorite made by Stokes. 
In the second example is shown the manner of adjusting silica among 
the different minerals after a preliminary calculation has indicated 
that too little silica is present to form the more highly siliceous ones. 
The analysis is one of Felix made by Fireman. 
