bowen: ANTHOPHYLUTE 411 



columns is frequently rather a garbling of events than a record of 

 events, the whole thrown purposely out of perspective in order 

 to cater to the "policy of the paper," the prejudices of the com- 

 munity which it serves, or the known attitude of the financial 

 interests supporting it or represented in its advertising columns. 

 And such misrepresentation of the facts is still further exag- 

 gerated by the choice and placing of the heads and sub-heads, 

 and by the editorial utterances. 



I have spoken of willingness to entertain and promote mis- 

 representation as "dangerous." It is dangerous because mis- 

 understanding and misrepresentation destroy sympathy be- 

 tween peoples of different nations, and where persisted in within 

 the borders of any one nation tend to weaken the ties which 

 bind classes together and, more than any other single thing— 

 except palpable and wide-spread injustice — pave the way for 

 those disturbances which may lead to civil war and revolution. 



MINERALOGY.- -Op//ra/ properties of anihophyllite. N. L. 

 Bowen, Geophysical Laboratory, Carnegie Institution of 

 Washington.^ 



In minerals of variable composition (solid solutions) a knowl- 

 edge of the corresponding variation of optical properties is 

 often of great importance, particularly since it renders possible 

 the determination of chemical composition by optical measure- 

 ment alone in cases where no other means may be available. 

 In attempting to check the optical properties of the pure artificial 

 magnesian amphibole, kupfferite, against those of natural antho- 

 phyllites the writer encountered a discrepancy in the data for 

 the natural mineral from Franklin, North Carolina. Penfield, 

 in his description of the Franklin crystals, gives two different 

 values for fi as determined by different methods."^ The attention 

 of Professor Ford was called to this matter and he kindly sent 

 me the original Penfield material, including oriented plates and 

 wedge. The wedge, which was made by polishing natural 

 prism faces, suffices for the measurement of two refractive in- 



1 Received June 19, 1920. 



2 Amer. Journ. Sci. 40: 396. 1890. 



