406 Scientific Intelligence. 



Although many interesting results are obtained, no explanation 

 is arrived at for the luminescence of the mineral ; it, is con- 

 cluded that there is no proof that the organic substance present 

 in the mineral, to which the color is probably due, has anything 

 to do with the fluorescence and the thermo-luminescence. The 

 regeneration of the latter power of chlorophane seems to indicate 

 that a part of the emitted light at least has an inorganic source. 

 — Proc. Amer. Acad, xli, No. 27, March, 1906. 



10. International Geological Congress. — The tenth annual 

 meeting of the Congres Geologique International will be held 

 in the City of Mexico from September sixth to thirteenth. A 

 most interesting series of excursions is announced in the prelimi- 

 nary circular. 



III. Miscellaneous Scientific Intelligence. 



1. National Academy of Sciences. — The Spring meeting of 

 the National Academy of Sciences was held at Washington on 

 April 16-18 ; thirty-four members were in attendance. The 

 following gentlemen were elected members of the Acadenw : 

 Benjamin O. Peirce, of Cambridge, Mass. ; W. B. Scott, of 

 Princeton, N. J. ; and Josiah Royce, of Cambridge, Mass. Prof. 

 Wilhelm Ostwald, of Leipzig, and Prof. H. A. Lorentz, of 

 Leiden, were elected foreign associates. The Draper medal was 

 presented to W. W. Campbell of the Lick Observatory at a 

 dinner given by Professor Alexander Agassiz at the new Willard 

 Hotel on April 17th. 



The following is a list of the papers presented at the meeting : 



J. McK. Cattell : The distribution of American men of science. 



C. S. Peirce : Eecent developments of existential graphs and their con- 

 sequences for logic. 



Theo. Holm : Commelinacese. Morphological and anatomical studies of 

 the vegetative organs of some North and Central American species. 



A. Agassiz and H. L. Clark : On the classification of the Cidaridae. 



Theo. Gill : Intei'ference of oviposition of a Sargasso fish with a flying 

 fish. 



H. F. Osborn : Faunal and geological succession in Eocene and Oligocene 

 Basins of Rocky Mountain region. 



W. J. Sinclair : Yolcanic ash in the Bridger Beds of Wyoming. 



C. E. Dutton : Radio activity and volcanoes. 



C. D. Walcott : Cambrian faunas of China. 



George E. Hale : Recent solar investigations. 



W. W. Campbell and C. D. Perrine : Some recent solar eclipse results. 



M. I. Pupin : Feeble, rapidly alternating, magnetization of iron. 



J. M. Crafts : Primary standards for temperature measurements between 

 100° and 350°. 



Asaph Hall : Biographical memoir of Admiral John Rodgers. 



W. M. Davis : Biographical memoir of George P. Marsh. 



Theo. Gill : The life history of Pterophryne. 



2. The Franklin Bi- Centenary. — A General Meeting of the 

 American Philosophical Society was held at Philadelphia on 

 April 17-20 in celebration of the two hundredth anniversary of 

 the birth of Benjamin Franklin. The introductory exercises 

 were held on Tuesday (l 7th) ; Wednesday was devoted to the 



