CONTENTS. 



PAGE 



I. Researches on the Hexatomic Compounds of Cobalt. By 



WOLCOTT GiBBS, M.D 1 



II. On the Solar Motion in Space and the Stellar Distances. 



By Truman Henry Safford ........ 52 



III. On the Veiled Solar Spots. By L. Trouvelot .... 62 



IV. On Photographs of the Solar Spectrum. By Robert 



Amory, M.D 70 



' V. Miscellaneous Botanical Contributions. By Asa Gray . 71 



VI. Botanical Contributions. By Sereno Watson : — 



1. On the Flora of Guadalupe Island 105 



2. List of a Collection of Plants from Guadalupe 



Island, made by Dr. Edward Palmer, with his 

 Notes upon them 112 



3. Descriptions of New Species of Plants, chiefly Cali- 



fornian, with Revisions of certain Genera . . . 121 



VII. Specimens of Milk from the Vicinity of Boston. By S. P. 



Sharples, S.B 119 



VIII. On Portable Astronomical Instruments and their Use. By 



Truman Henry Safford 157 



IX. On some Physical Observations of the Planet Saturn By 



L. Trouvelot 174 



X. The Companions of Procyon. By Rear-Admiral C. H. 



Davis 185 



XI. Notes on Magnetic Distribution. By Henry A. Rowland. 191 



XII. On the Method of Least Squares. By Truman Henry 



Safford 193 



XIII. Brief Contributions from the Physical Laboratory of Har- 



vard College. By John Trowbridge : — 



4. On the Effect of Thin Plates of Iron used as Arma- 



tures to Electro-Magnets 202 



5. On the so-called Etheric Force 206 



6. On a New Form of Mirror Galvanometer .... 208 



XIV. On the Solar Motion and the Stellar Distances. By Tru- 



man Henry Safford 210 



