70 Royal Institution of Great Britain. 



21 to April 14. On the latter, Mr. Dunlop remarks, (March 21,) 

 that it resembled a small bright nebula, about l£' diameter, with a 

 very faint stream of light proceeding from the head, at intervals, ex- 

 ceedingly rare, and of a very pale bluish colour, remarkably different 

 from that of the head. The first was observed with a parallel wire- 

 and the second with a ring-micrometer. 



The places of the comets, according to Mr. Henderson, are given 

 in the Monthly Notices. 



X. Observed Transits of the Moon and Moon -culminating Stars 

 over the meridian of Edinburgh Observatory, in January and Feb- 

 ruary 1835. 



XI. Transits of the Moon with Moon -culminating Stars, observed 

 at Cambridge Observatory in the months of January and February, 

 1835. 



PROCEEDINGS AT THE FRIDAY-EVENING MEETINGS OF THE 

 ROYAL INSTITUTION OF GREAT BRITAIN. 

 [Continued from vol. vi. p. 394.] 



May 1. — Dr. Lardner on Halley's comet, and its reappearance in 

 the autumn of this year. 



May 8. — Professor Whcatstone on the construction and uses of 

 speaking machines. 



May 15. — Mr. Faraday on the condition and use of the tympanum 

 of the ear. 



May 22. — Mr. Brockedon on the storms which occurred on the 

 Alps in August 1834. 



May 29. — Mr. Davidson on Thebes. 



June 5. — Mr. Cowper on engraving, carving, and sculpturing by 

 machinery. 



June 1 2. — Mr. Wilkinson on the manufacture and force of gun- 

 powder. — Conclusion of the season. 



CAMBRIDGE PHILOSOPHICAL SOCIETY, LENT TERM, 1835. 

 [Continued from vol. vi. p. 3.96.] 



Monday (May 4th), the Rev. G. Peacock, the Treasurer, in the 

 Chair, rrof. Airy gave an account of recent results obtained at the 

 Observatory j namely, 1st. That the discrepancy of the observations 

 of the obliquity of the ecliptic at the summer and winter solstices 

 formerly noticed, had disappeared on using the refraction correspond- 

 ing to a new barometer which stands 1-1 Oth of an inch higher than 

 the one formerly used. 2nd. That the mass of Jupiter, as determined 

 by observations of the 4th satellite in 1834, is almost exactly the 

 same as that obtained in 1832 and 1833, namely, 1-1 048th of the 

 sun's mass. 3rdly. That the time of rotation of Jupiter, as determined 

 by a spot, is 9 U 55 m 21 s : the spot from which this determination 

 was obtained made 225 revolutions in 93 days. 



Afterwards Mr. Whewell gave an account of the results of his ex- 

 amination of the tide observations made last June at the stations of 

 the coast-guard service. 



Monday evening (May 18th), Prof. Airy, V.P. in the chair. A paper 



