448 



Papers Presented. P<^9e- 



Barker, George F. 



On the Henry Draper Memorial Photographs of Stellar Spectra 166 



BiiAsius, William. 



The Signal Service Bureau, its Methods and Results 179 



Brinton, Daniel G. 



Critical Remarks on the Editions of Diego de Landa's Writings 1 ' 



Were the Toltecs an Historical Nationality 229 



On the so-called Alaguilac Language of Guatemala 366 



On an Ancient Human Footprint from Nicaragua 437 



Claypole, E. W. 



Organic Variation Indefinite not Definite in Direction— an Outcome of Envi- 

 ronment 113 



Cope, E. D. 



Synopsis of the Batrachia and Reptilia obtained by H. H. Smith in the Province 



of Mato Grosso, Brazil 44 



Contribution to the History of the Vertebrata of the Trias of North America. . 209 

 Classification and Philogeny of the Artiodactyla 377 



Frazer, Persifor. 



Remarlis on Dr. Barker's paper on Stellar Spectra 171 



Oarman, Samuel. 



On tlie Reptiles and Batrachians of Grand Cayman 273 



On West India Reptiles in the Museum of Comparative Zoology at Cambridge, 

 Mass 278 



Garrett, Philip C. 



Memoir of Pliny Earle Chase 287 



Genth, F. a. 



Contributions from the Chemical Laboratory of the University of Pennsylvania. 

 No. XXIX. Contributions to Mineralogy 23 



Houston, Edwin A. 



On a Non-magnetizable Watch 418 



On the Gramophone 420 



KiRKWooD, Daniel. 



The Relations of Aerolites to Shooting Stars Ill 



Biela's Comet and the Large Meteors of November 27-30 242 



Note on the Possible Existence of Fireballs and Meteorites in the Stream of 

 Bielids 436 



Leidy, Joseph. 



Biographical Notice of Isaac Lea, LL D 400 



MooNEY, James. 



The Medical Mythology of Ireland 136 



OsBORN, Henry F. 



The Triassic Mammals, Dromatherium and Microconodon 109 



Packard, A. S. 



On the Systematic Position of the Mallophaga 264 



ScOTT, W. B., and Osborn, Henry F. 



Preliminary Report on the Vertebrate Fossils of the Uinta Formation collected 

 by the Princeton Expedition of 1886 255 



