Lithological Nomenclature. 247. 



In pronunciation, the accent should be placed upon such sjlla- 

 bles as will best retain the original sounds of the abbreviations, 

 so far as convenience of utterance will permit. 



Since a gradual transition, advantageous at all stages, is to be 

 preferred to a sudden revolution, it is suggested that the new 

 terms may be introduced in lithological discussions in parenthesis 

 after the usual names. The new terms will thereby not merely 

 serve as definitions of the old as used, but as succinct statements 

 <A the composition of the special rocks described, which is often, 

 but vaguely indicated by the common names. This will often 

 permit a shortening of descriptions, and will certainly foster pre- 

 cision of observation and statement, while (if a brief explanation 

 of the system and a list of abbreviations are given until they 

 become well known) it will greatly serve the convenience of 

 students, semi-scientific readers, and not a few geologists who may 

 not be specialists in lithology and freshly familiar with its 

 terms. The system would thus have opportunity to perfect itself 

 while growing into general use. 



