110 Edward Sang, Esq., on the 



after our return, the longitude was found to be 18"^ 04^ east 

 of my present residence. 



As I had hitherto made no very careful observations to 

 determine my longitude here, not anticipating any protracted 

 stay, I resolved to postpone sending my report until an op- 

 portunity should have occurred of verifying it. For this 

 purpose the occultation of 74 Aquarii was observed on the 

 9th September, and at the same time the right ascension of 

 the meridian was taken by help of the altitudes of a Polaris, 

 Arcturus, and Vega. This plan I was forced to by the want 

 of a distant night-signal for my meridian. On making the 

 computations strictly without any approximate operations 

 there came out lat. 41° 03' 06", Ion. 1^ 55™ 51% which thus 

 gives for the longitude of the quarantine station at Sebastople 

 2^ 13™ 55«. 



As we had not been fortunate enough to observe either of 

 the contacts so as thence to deduce directly the longitude of 

 Sebastople, we were thrown upon our other resources, viz., 

 the angular distances of the cusps, and the breadth of the 

 illuminated part. Seeing, however, that with the sextant we 

 can hardly come within 15", especially when we use darken- 

 ing glasses, and that this would give an uncertainty of 30^ in 

 longitude ; and seeing also that towards the end of the eclipse 

 the cusps approach each other very rapidly, it followed that 

 our most favourable observation was the last made by Mr 

 Jelesnoff. From it, and from the observations on the alti- 

 tude of the sun's lower limb, the longitude was found to be 

 2h 14m 08^, only 13^ more than that found by the chrono- 

 meter. 



All of these results indicate a greater longitude for Con- 

 stantinople than that usually given in the books, for which 

 reason I have deferred the transmission of this report, await- 

 ing the opportunity of another occultation. Having prepared 

 the preliminary calculations for that of B.A.C. 6607, I have 

 just been disappointed by the otherwise welcome appearance 

 of rain-clouds. The next occultation visible here is that of 

 ^ Ceti on the 11th, for which, considering the chance of broken 

 weather, it is scarcely worth while to wait. 



In conclusion, I have to regret that an unaccountable delay 



