SUBJECT INDEX 



535 



*Prunella niodularis, new subspecies from 



Pyrenees. F. Harper. 63. 

 ^Ptarmigan, new, from Mt. Rainier. W. 



P. Taylor. 495. 

 *Quiscalus quiscula, races of. H. C. Ober- 



HOLSER. 62. 

 *Rhynchocyclus, relationships and geo- 

 graphic distribution of species and 



races of. C. B. Cory. 111. 

 *Rookeries of the Tortugas. P. Bartsch. 



60. 

 *£outh American birds, new. W. E. C. 



Todd. 511. 

 *South America, new birds from Peru, 



Bolivia, Brazil, and Colombia. F. M. 



Chapman. 111. 

 Tinamidae, new birds of family. Alex. 



Wetmore. 434. 

 *Tortugas, bird rookeries of. P. 



Bartsch. 60. 

 *Washington, all-day bird trip at. H. C. 



Oberholser. 112. 

 *Washington region, Oct.-Nov., 1919. 



H. C. Oberholser. 512. 

 *Waterfowl in Neb. H. C. Oberholser. 



495. 

 *Whippoorwill, new from Porto Rico. 



Alex. Wetmore. 60. 

 Paleontology. Brachiopod, shell regenera- 

 tion in. W. A. Price. 32. 

 *Fauna of Cannonball marine member of 



Lance formation. T. W. Stanton and 



T. W. Vaughan. 138. 

 tNational Museum, paleontological work 



at. R. S. BasslER. 315, 446. 

 *Orthatilax, Tertiary guide fossil. C. W. 



Cooke. 471. 

 *Orthophragmina and Lepidocyclina, 



American species of. J. A. Cushman. 



194. 



*Orthophragmina, new species, from La. 



J. A. Cushman. 511. 

 *Operculina and Heterostegina, American 



species of. J. A. Cushman. 511. 

 fReptiles, reconstruction of extinct. C. 



W. GiLMORE. 426. 

 fVertebrate, fossil, exhibit in the National 



Museum. C. W. Gllmore. 66. 

 Petrology. Essex Co., Mass., igneous rocks 



of. C. H. Clapp. 470. 



Granites of Washington, D. C. H. S. 

 Washington. 459. 



*Italite, new leucite rock. H. 

 vS. Washington. 346. 



Lamprophyre dike cutting a pyrite body 

 in Boyd Smith mine, Va. T. L. Wat- 

 son. 341. 



Monticellite alnoite from Isle Cadieux, 

 Quebec. N. L. Bowen. 278. 



Obsidian from Copan and Chichen Itza. 

 H. S. Washington. 481, 



*Rhyolites of Lipari. H. S. Washington. 

 392. 



Physical Chemistry. Acidity, methods of 

 stating. E. T. Wherry and E. Q. 

 Adams. 197, 202. 



Acidity, Wherry and Adams' methods of 

 stating, reply to. W. M. Clark. 199. 



Chemical structure and physiological ac- 

 tion. C. L. Alsberg. 321. 



*Melting point curve, estimating impuri- 

 ties by. W. P. White. 113. 

 Physics. fAerial navigation. H. H. Eaton. 

 498. 



fAeronautic instruments, old and new 

 problems of. M. D. Hersey. 22. 



fAeronautics, meteorological factor in. 

 C. L. Meisinger. 283. 



fAircraft engines at high altitudes. H. 

 C. Dickinson. 22. 



*Annealing of glass. L. H. Adams and 



E. D. Williamson. 417. 

 fDensity of strained glass. L. H. Adams 



and E. D. Williamson. 284. 

 fDental materials, physical properties of. 



W. H. SouDER and C. G. Peters. 37. 

 Diamond, compressibility of. L. H. 



Adams. 45. 

 fElectrical resistance of the human body. 



F. Wenner, J. S. Martin, and N. L. 

 Forman. 286. 



fElectricity, diurnal variation of atmos- 

 pheric. S. J. Mauchly. 398. 



Furnace temperature regulator. H. S. 

 Roberts. 401, t497 



*Gases, efflux of, through small orifices. 

 E. Buckingham and J. D. Edwards. 

 209. 



fGeoidal slope, law of, and fallacies in 

 dynamic meteorology. C. F. Marvin. 

 211. 



