RESEARCHES 



RELATIVE TO 



THE PLANET NEPTUNE. 



The Memoir which I have the honor to present to the Smithsonian Institution 

 relative to the planet Neptune, is divided into four sections, as follows: 



SECTION 1. 



ABSTRACT OF EVENTS CONNECTED WITH THE DISCOVERY OF NEPTUNE, THE PROGRESS MADE 

 IN ITS THEORY, AND THE COMPLETION OF THE THEORY OF URANUS. 



SECTION 2. 



DETAILED ACCOUNT OF THE DISCOVERY OF THE TWO ANCIENT PLACES OF NEPTUNE, OBSERVED 



BY LALANDE IN MAY, 1795. 



SECTION 3. 



COMPUTATIONS CONFIRMING THE AUTHENTICITY OF LALANDE'S PRINTED OBSERVATIONS. 



SECTION 4. 



SUBSEQUENT RESEARCHES ON THE ORBIT OF NEPTUNE. 



In this inquiry, it has been necessary to compute an Ephemeris of the planet 

 for every day in which Neptune has been visible, and to compare with it 

 nearly all the observations extant. Since it is desirable to make this group 

 of observations, properly reduced, a matter of permanent record, this Ephemeris* 

 is also respectfully submitted, together with the differences from it indicated 

 by the standard observations. 



* For the sake of the more prompt appearance of this Ephemeris, it was pubhshed in advance of the Memoir, and 

 separately distributed, in 1849. See Appendix, No. I, to this volume. — Sec. Smithsonian Institution. 



Art. 1. — 1 



