550 Eclipses of Jupiter* s Satellites. [Dec. 



Depth of the river. 



ft. in. 



July 22d, 19 6 



30th, 22 6 



July 7th, 25 6 



14th, 28 



23rd, 30 



Aug. 1st, 35 6 



8th, 44 



13th, 47 6 



22nd, 42 



31st, 36 



Sept. 6th,... 38 



15th, 37 6 



24th, 28 6 



Oct. 1st, 26 6 



or an average of 33 ft. for the four months. 



Note. — It will be observed, that the averages here given are considerably less than 

 for the last year (1831), as stated in the Journal for June. But on comparing the 

 fall of rain for that, and the present year, as stated in the Meteorological Registers, 

 I am inclined to think that the previous estimate for 1831 is not excessive, but 

 defective. The small branch, or stream, when the river was at the highest, would 

 have a depth of about 12 ft. and a breadth of about 300 ft., an addition so trifling 

 to the main stream, that I have made no allowance for it. 



IV. — Eclipses of Jupiter's Satellites. 



Observed by Mr. Walter Ewer. November, 1832. 

 Nov. 3. At Chaprah, with 5-feet achromatic, power 150. 



Mean time Diff. from Diff. from Cal- 

 observed. Naut. Aim. cutta obs. 



h. m. s. h. m. s. h. m. s. 



Emersion II Sat 7 37 45 5 38 57 14 23 W. 



Nov. 4. At Digwareh, on road to Hajipur, 3J-ft. achrom. power 100. 



Emersion I Sat 6 35 00 5 40 08 13 12 W. 



Nov. 10. At Hajipur, (Lat. 25 Q 41' 11" by sextant,) same telescope. 



Emersion III Sat 7 4151 5 4119 12 14 W. 



Nov. 11. Do. Emersion I Sat 8 3135 5 40 50 12 12 W. 



Nov. 27. At Chaprah, 5-ft. achromatic, power 150, "capital observation." 



Emersion I Sat 6 50 36 5 38 53 14 34 W. 



The last column shews the difference as deduced from the Calcutta observation, 

 made with a telescope of nearly the same power — (vide page 505-6.) 



