CLASSIFICATION OF IGNEOUS ROCKS 559 
CaO! 
K een AO! instead of only the salic CaO and salic K,O and Na,O; 
that is, only the CaO allotted to normative anorthite, and only 
the K,O and Na,O allotted to normative orthoclase, albite, leucite, 
nephelite, and NaCl or Na,SO,. In like manner the CaO, Na,O, and 
K,O used in determining rangs, subrangs, and sections of subrangs 
MgO+FeO+Na,0”+K,0” 
CaQ” meUG., 
are only the femic CaO and femic Na,O and K,O; that is, the CaO 
that has not been allotted to anorthite, and the Na,O and K,O not 
allotted to salic minerals. 
An error is sometimes made in calculating the rangs and sub- 
rangs in classes TV and V.. The MgO and FeO involved are all the 
MgO and FeO in all the femic minerals, silicates and non-silicates ; 
that is, all in the rock analysis. 
Misuse of the terms salic and femic.—There appears to be an 
indifference among petrographers as to the correct use of scientific 
terms, which is perhaps inherent in the conditions attending the 
beginnings of any new branch of science, and suggests that indiffer- 
ence to the manners and customs of old established communities 
which is characteristic of frontier life in newly settled countries. 
It indicates a sense of self-sufficiency on the part of the individual 
petrographer which, in the matter of his use of words, is typified 
in the conscious superiority of ‘ Alice’s”’ friend “‘Humpty Dumpty” 
over these servants of human speech. The petrographer also has 
no intention of being mastered by mere words, and is in the habit 
of using them as he himself chooses, without regard to original 
in Classes IV and V by the ratios 
«“There’s glory for you,” said Humpty Dumpty. 
“‘T don’t know what you mean by glory,” Alice said. 
Humpty Dumpty smiled contemptuously. ‘Of course you don’t—till I tell 
you. I meant there’s a nice knock-down argument for you!” 
“But glory doesn’t mean ‘a nice knock-down argument,’’’ Alice objected. 
‘When J use a word,” Humpty Dumpty said in rather a scornful tone, ‘‘it means 
just what I choose it to mean—neither more nor less.” 
“The question is,”’ said Alice, ‘‘whether you cam make a word mean so many 
different things.” 
“The question is,” said Humpty Dumpty, “which is to be master—that’s all.””— 
Through the Looking Glass, by Lewis Carroll; Carl Ludwidge Dodgson, Mathema- 
tician, Oxford. 
