March 8, 1918] 



SCIENCE 



245 



A necessary and sufficient Condition for the 

 Existence of a Stieltjes integral: Gilbert 

 Ames Bliss, Department of Mathematics, Uni- 

 versity of Chicago. 



Transformations of Applicahle Conjugate 

 Nets of Curves on Surfaces: Luther Pfahler 

 Eisenhart, Department of Mathematics, Prince- 

 ton University. 



On Bilinear and X-Linear Functionals: 

 Charles Albert Fischer, Department of Mathe- 

 matics, Columbia University. 



The Crystal Structure of Chalcopyrite De- 

 termined hy X Rays: Charles L. Burdick and 

 James H. Ellis, Chemical Laboratories, Throop 

 College of Technology'. Chalcopyrite belongs 

 to the tetragonal system of crystals, few of 

 ■which have been examined for structure. The 

 lattice is of the face-centered type. 



The Isostatic Subsidence of Volcanic Is- 

 lands: W. M. Davis, Department of Geology 

 and Geography, Harvard University. Dar- 

 win's primary theory of coral reefs holds good, 

 although his supplementary theory of broad 

 ocean-floor subsidence needs modification. 



On the Deformation of an N-CeJl: Oswald 

 Veblen, Department of Mathematics, Prince- 

 ton University. 



A Theorem on Series of Orthogonal Func- 

 tions ivith an Application to Sturm-Liouville 

 Series: George D. Birkhoff, Department of 

 Mathematics, Har\-ard University. 



Low-Temperature Formation of Alkaline 

 Feldspars in Limestone: Reginald A. Daly, 

 Department of Geology and Geography, Har- 

 vard University. A review of recent Eu- 

 ropean literature and a discussion of American 

 Rocky Mountain dolomite. 



The Interferometry of Sm,all Angles, etc. 

 Methods hy Direct and Reversed Superposed 

 Spectra: Carl Barus, Department of Physics, 

 Brown University. 



The twelfth number of Volmne 3 contains 

 the following articles: 



Incompatibility of Mutant Races in Droso- 

 phila: C. W. Metz and C. B. Bridges, Car- 

 negie Station for Experimental Evolution, and 

 Columbia University. The evidence from two 

 cases of incompatibility in laboratory cultures 



taken with evidence from apparently mutant 

 forms and incompatible varieties of nature 

 tends to remove a serious objection to the 

 mutation hypothesis and emphasizes the pos- 

 sible evolutionary importance of mutations in- 

 volving incompatibility. 



Absorption Effects in the Spiral Nebulce: 

 Heber D. Curtis, Lick Obsen-atory, University 

 of California. Negatives of spiral nebulae ob- 

 tained with the Crossley Reflector show that 

 the phenomenon of dark lanes caused by oc- 

 culting or absorbing matter is much more fre- 

 quent than has been supposed. The results 

 may bear directly on the explanation of the 

 peculiar grouping of the spirals. 



The Synergetic Action of Electrolytes : Oran 

 L. Raber, Laboratory of Plant Physiology, 

 Harvard University. Synergy is the opposite 

 of antagonism; although antagonism is fre- 

 quently reported, few cases of synergy have 

 been noted. 



Appetites and Aversions as Constituents of 

 Instincts: "Wallace Craig, University of 

 Maine, Orono. Although innate chain re- 

 flexes constitute a considerable part of the 

 equipment of doves, few or none of their in- 

 stincts are mere chain reflexes. On the con- 

 trary each instinct involves an element of ap- 

 petite, or of aversion, or both. 



Rapid Respiration after Death: A. R. C. 

 Haas, Laboratory of Plant Phsiology, Har- 

 vard University. The respiration of Lamin- 

 aria may be much greater after death than in 

 the normal condition. 



The Means of Locomotion in Planarians: 

 Caroline E. Stringer, Zoological Laboratory, 

 Radcliffe College. The locomotion is essen- 

 tially a muscular act in which the cilia play 

 no necessary part. 



Diurnal Changes in the Sea at Tortugas, 

 Florida: J. F. McClendon, Department of 

 Physiology, University of Minnesota and 

 Tortugas Laboratory, Carn^ie Institution of 

 Washington. 



Note on Interferometer Methods of Meas- 

 uring the Elastics of Small Bodies: Carl 

 Barus, Department of Physics, Brown Uni- 

 versity. 



