IV CONTENTS. 



PAGE 



X. Photometric Researches. By William H. Pickering . . 236 



XI. The Atomic Weight of Antimony. By Josiah P. Cooke . 251 



XII. On the Ethers of Uric Acid. Second Paper. Dhnethyluric 



Acid. By H. B. Hill and C. F. Mabery .... 256 



XIII. Researches on the Substituted Benzyl Compounds. By C. 



Loring Jackson. Eighth Paper. By J. Fleming 



White 267 



XIV. On a Mechanical Attachment for Equatorial Mountings, to 



facilitate Sweeping in Right Ascension. By D. P. Todd, 



M.A 270 



XV. On the Present State of the Question of Standards of Length. 



By W. A. Rogers 273 



XVI. The Columnar Architecture of the Egyptians. By Waldo S. 



Pratt 313 



Proceedings 367 



Memoirs : — 



William Turell Andrews 377 



Erastus Brigham Bigelow 378 



Thomas Mayo Brewer 378 



Samuel Greene Arnold 380 



Isaac Hays 380 



William T. Roepper 381 



Heinrich Wilhelm Dove 383 



James Clerk Maxwell 391 



Eugene Emmanuel Viollet-le-Duc 394 



List of the Fellows and Foreign Honorary Members . . 400 



Index 407 



