[ 237 ] 114 



I. RED PIPESTONE QUARRY. 



For the occultation of o Virg-inh, observed at this place, I am not abfe 

 10 find any corresponding observations. I have therefore to take the re- 

 sulting longitude, as given in the preceding Table I, uncorrected. We 

 have, then, 



Longitude deduced from the occultation - 



Longitude by 4 sets, or 60 lunar distances, east and west 5 



Mean - . 6 25 17.74 



Longitude in are - 96° 19' 26'M 



II. COTEAU DU MISSOURI — ENCAMPMENT 6tH JULY, 1839, ON WESTERN 



SLOPE. 



The Table I shows that the occultation of rj Tauri, observed here, may 

 be compared with corresponding observations of the same star, made at 

 three different places in the United States. 



In a recent number of the Astronom. Nachrieht, Bessel gives the cor- 

 rection of the right ascension and declination of »? Tauri, as used in the 

 Nautical Almanac, viz: aAH = 0".9 m arc, and A D = — 2".5 in arc; 

 whence *' = + l".460 and T = + 2".617. 



Using the longitudes of the stations of comparison, as given above, and 

 applying the corrections at' and b f' in the formula (A), we have 



Longitude by comparison with Hudson observatory 



with Washington city 

 with Philadelphia 



Mean 



Longitude in arc 



III. ST. LOUIS — THE CATHEDRAL. 



For the occultation of »? Tauri, observed here on 20th November, 1839, 

 we have to use the corrections of the star's place, as at the preceding station. 

 We find, besides, by the Greenwich observations of the same day, for the 

 corrections of the moon's right ascension and declination — 



A A1 = — 6".6 in arc : and A D = — 4".65 in arc, when ( = — 7'.014 

 and ?== — 2".956. 



There is but one place of comparison — Dorchester, Massachusetts, at 

 Mr. Bond's private observatory. Applying, then, the values a«', a (« -|- «') 

 and b V, 6, (t + r,) we find : 



h. m. s. 

 Xongitudeby comparison with Dorchester observatory - 6 52.73 



with Greenwich meridian obs'y - 6 55.60 



Mean - - - - 6 54.16 



