THE POTOMAC AND RAPPAHANNOC. 293 



that it appears formerly to have been a spacious lagoon of the 

 sea, of which these particular sand hills are the shore. 



B. HENRY LATROBE, F. A. P. S. 



Surveyor of the Public buildings of the U. States. 



No. XLVII. 



Further Observations oji the Eclipse of 1 6th June, 1 806, being 

 an Appendix to No. XLI1I, page 264 of this Volume, by J. 

 J. de Ferier. 



Read April 17th, 1807- 



SINCE the Memoir was printed I have received the follow- 

 ing observations. 



At the Hydrographic Repository at Madrid, Don Philip Bauza 

 lieutenant in the Royal Navy, observed the beginning of the 

 eclipse at 4" 27' 48" 6, and the end at 6 k 09' 07" 2 apparent 

 time. Latitude of the Repository 40° 25' 08". Longitude 

 west of Paris 24' 08" in time. Magnifying power of the tele- 

 scope 1 10. 



At the Royal Observatory in the Island of Leon, Don J. 

 M. de la Cuesta, lieutenant in the Royal Navy, observed the 

 commencement 4" 18' 42" 2 apparent time. The end was 

 not observed on account of the clouds. Latitude of the ob- 

 servatory 36° 27' 45". Longitude west of Paris 34' 08". — 

 Magnifying power of the telescope 53. 



1 have re-calculated all the observations of page 273, mak- 

 ing use of the new solilunar tables, published in Paris, 1806, 

 by the Commissioners of longitude. They are as follows, for 

 4* 29' 41", mean time in Paris. 



