682 



SUBJECT INDEX 



♦Ternary system CaO-MgO-SiOj. J. 

 B. Ferguson and H. E. Merwin. 

 629. 



*Tridymite, melting points of cristo- 

 balite and. John B. Ferguson and 

 H. E. Merwin. 103. 



*Wollastonite and related solid solu- 

 tions in the ternary system CaO- 

 MgO-Si02. J. B. Ferguson and 

 H. E. Merwin. 630. 

 Interferometry . Dilatations, small or 

 differential, the use of the interfer- 

 ometer in measurement of. C. G. 

 Peters. 281. 

 Mammalogy. *African, east, mammals, 

 in the United States National Mu- 

 seum. N. HOLUSTER. 50. 343- 



fBison, number of, in North America. 

 T. S. Palmer. 356. 



^Cervus roosevelti. W. P. Taylor. 

 355- 



*Napaeozapus, the Wisconsin. Hart- 

 ley T. Jackson. 201. 



Mathematics. Rotations in hyperspace, 

 note on. Edwin Bidwell Wilson. 

 25. 

 Strains due to temperature gradients, 

 with special reference to optical 

 glass. Erskine D. Williamson. 

 209. 



Metallurgy. *Aluminum and its light 

 alloys. Bureau of Standard Cir- 

 cular. 445. 



*Steel alloy, effect of rate of temper- 

 ature change on the transformations 

 in a. H. ScoTT. 446. 



*Tin, conservation of, in bearing 

 metals, bronzes and solders. G. K. 

 Burgess and R. W. Woodward. 



341- 



Meterology. fEclipse, solar, of June 8, 

 191 8, meteorological phenomena of. 

 Herbert H. Kimball and S. P. 

 Ferguson. 20. 



fTrans-Atlantic flight from the me- 

 teorologist's point of view. W. R. 

 Gregg. 353. 

 Mineralogy. *Augite from Stromboli. 

 S. Kozu and Henry S. Washing- 

 ton. 104. 



Copper silicates, shattuckite and 

 plancheite. W. T. SchallER. 131- 



flron-hydroxide minerals, the. H. E. 

 Merwin and E. Posnjak. 108. 



Plancheite and shattuckite, copper sil- 

 icates. W. T. Schaller. 131- 



fPotash-containing marls of the east- 

 ern United States. R. H. True. 

 146. 



*Stromboli, augite from. S. Kozu 

 and H. S. Washington. 104. 



Mycology. *Apple scald. Charles 

 Brooks, J. S. Cooley, and D. F. 

 Fisher. 378. 

 *Citrus-canker, susceptibility of ruta- 

 ceous plants to. H. Atherton LeE. 

 376. 



\Cortinarius, the genus. C. H. Kauf- 



mann. 415. 



*Cronartium ribicola, parasitism, 

 morphology and cytology of. Reg- 

 inald H. COLLEY. 377. 



*Physoderma disease of corn. W. H. 



Tisdale. 378. 

 *Rhizoctonia in lawns and pastures. 



C. V. Piper and H. S. CoE. 329- 



Navigation. *Altitude, azimuth, hour 

 angle. G. W. Littlehales. 232. 



♦Altitude of celestial body, instru- 

 mental means to enable the navi- 

 gator to observe, when horizon is 

 not visible. G. W. LittelhalES. 

 231. 



*Chart as a means of finding geo- 

 graphical position by observations 

 of celestial bodies in aerial and 

 marine navigation, the. G. W. 

 Littlehales. 233. 



