686 



INDEX. 



Sodium, 524. 



Sodiimi Chloride, 161, 608, 620. 



Space Differentiation, (ieneralized 

 of. tlie Second Order, ;375-386, 

 611. 



Spectra, False, from Diffraction Grat- 

 ings, 37-47, 620. 



Spectra from the Wehnelt Inter- 

 rupter, 517-.o44, 612. 



Spectral Lines, On the Prolongation 

 of, 31-35, 608. 



Spermatophytes, Diagnosis and Syn- 

 onymy of ^Mexican and Central 

 American, 612. 



Standing Committees, appointed, 

 622. 



Standing Votes, 678. 



Statics, A Problem in, and its Re- 

 lation to Certain Algebraic In- 

 variants, 623. 



Statutes, 669. 



SttMitor. See Protozoa. 



Steiihen, Sir Leslie, Death of, 613 



Stimson, F. J., appointed Auditor, 

 608. 



Storrovv, C. S., Death of, 616. 



Story, VV. E , On a New General 

 Theory of Errors, 615. 



Strontium, 528. 



Surface-Color of Nitroso-dimethyl- 

 aniline, The Anonuilous Disper- 

 sion, Ab.sorption, and, 49. 



Taber, IL, On the Real Autonmrphir 

 Linear Transformation of a Real 

 IHlinear Form, 30.O-32I1, 609. 



Tin, 5 17. 



Tonks, O. S., The xVthenian ^'ase- 



Painter Brygos, and his Char- 

 acteristics, 608. 



Treasurer, Report of, 616-617. 



Trixis, Revision of the Mexican 

 and Central American Species of, 

 612. 



Turkestan, Explorations in, 611. 



Vectors, On the Lines of Ceitain 

 Classes of Solenoidal or Lamel- 

 lar, 293-304, 609. 



Villari, P., elected Foreign Honorary 

 Member, 614. 



Volume, The Significance of Chang- 

 ing Atomic, 612, 579. 



Warren, C. M., Committee, letter re- 

 ferred to, 610 ; report of, 020. 



Warren (C. M.) Fund, 617 ; Appro- 

 priations from the Income of, 

 620, 621. 



Wehnelt Interrupter, Spectra from, 

 517, 612, 620. 



Williams, F. IL, Some of the Prop- 

 erties and Uses of Radium Salts, 

 611. 



Wood, R. AV., The Anomalous Dis- 

 persion, Alisorption, and Surface- 

 Color of Nitro.so-dimetliyl-aniline, 

 49-06, 620. 



Zinc, .535. 



Zittel. K. A. R. von, accepts Member- 

 ship, 610; Death of, 611. 



Zoological Laboratory of the Museum 

 of Comparative Zoology at Har- 

 vard College, Contributions from, 

 221, 257, 439. 



