504 



SCIENCE. 



[N. S. Vol. IV. No. 92. 



If we know p=f (r) we can now solve for w. 

 Assuming p proportional to the brighness, it is 

 suggested that we find by observation 



P=f{r) 



and the angular velocity of the nebula at any 

 point may be found, except with regard to the 

 constant of integration. 



Hydro- dynamical Investigation of the Solar Ro- 

 tation : By E. J. Wilczynski. An applica- 

 tion of Lagrange's differential equations for 

 the motion of a fluid, to the case of the 

 sun. Assuming the sun to be gaseous, it is 

 found that the angular velocity of any point 

 within it or upon its surface depends only upon 

 its distance from the axis of rotation, and the 

 distribution of density and pressure within the 

 sun as a whole, i. e. , all points on a cylinder 

 with the sun's axis as center revolve with the 

 same angular velocity, but the differential slip- 

 ping of these cylinders upon one another de- 

 pends upon the internal conditions of tempera- 

 ture and pressure. If another relation between 

 these three quantities w, p and t could be found, 

 the above conditions could be found as func- 

 tions of the observed law of rotation. 



Researches on the Arc Spectra of the Metals. II. 

 The Spectrum of Titanium: By B. Hasselberg. 

 The article is devoted to a consideration of 

 the spectrum of titanium, from /I 3450 to D. 

 Our present knowledge of the spectrum rests 

 upon Thai en's work of thirty years ago, and con- 

 sequently is not accurate as measured by mod- 

 ern standards. Many new lines have been dis- 

 covered by the author and some of the old ones 

 resolved. Extreme care was taken to eliminate 

 impurity lines. All lines occurring within 0.1 

 meter of lines catalogued as belonging to other 

 metals were compared with them on the same 

 photographic plate and classified as follows : 



A. As belonging to titanium. 



(a.) All lines distinctly separated from those 

 of comparison metal. 



(6.) Those lines coinciding with comparison 

 lines but having greater intensity. 



(c.) Lines exactly coinciding and strong in 

 both spectra (probably belonging to both). 



B. As doubtful. Lines coinciding, but so feeble 

 in both spectra as to make them possible results 

 of a common impurity. 



C. As impurity lines, those weak in titanium 

 spectrum and strong in comparison spectrum. 



Comparisons with the spectra of Fe, Co, Ni, 

 Cr, Mn, Mg, Zn, Hg, Al, Pb, Sb, Na, K, 

 Cs and Th, served to eliminate many impurity 

 lines. These metals have been investigated by 

 Kayser and Runge, and the comparisons cast 

 doubt upon the legitimacy of some of the lines 

 catalogued as belonging to these elements. 



Minor contributions and Notes, including ' On a 

 New Method of Preparing Plates Sensitive to 

 the Ultra-violet Rays,' one of the series of 

 articles by V. Schumann. 



Reviews of recent papers on astro-physical 

 subjects. 



THE MONIST — OCTOBER. 



C. Lloyd Morgan, in Animal Automatism 

 and Consciousness, examines Huxley's and Des- 

 cartes's views, rejects the theory that conscious- 

 ness is a collateral product of brain action, and 

 claims for consciousness a role of guidance both 

 in the acquisition and utilization of habits, all of 

 which is effected by association and suggestion. 



In The Regenerated Logic, C. S. Peirce sub- 

 mits to critical examination Ernst Schroeder's 

 great work, discusses the way in which profes- 

 sional opinion is formed, treats of the nature 

 and scope of logic generally, and of ' assertion,' 

 of hypothetical and categorical propositions, and 

 of the quantification of the predicate in particu- 

 lar. 



The third article is by E. Douglas Fawcett 

 and is entitled From Berkeley to Hegel, being a 

 chapter of the history of philosophy ' embody- 

 ing a critique of the panlogist phase of idealism.' 

 The treatment is thoroughly speculative in 

 character (the author attempting to resuscitate 

 the Leibnitzian monadology), and hence is the 

 occasion of a reply from the editor, Paul Carus, 

 who, under the caption of Fanlogism, expounds 

 anew his theories of mind, the soul and im- 

 mortality. 



The concluding article is by George Bruce 

 Halsted, Subconscious Pangeometry, and treats 

 of certain mooted points in the history of the 

 theory of parallel lines and of the Non-Eucli- 

 dean geometry. The usual correspondence fol- 

 lows, with quite a long list of reviews of im- 

 portant publications in philosophy and science. 



