Notices respecting New Books. 219 
it continues to thin off; but it may be traced, though not with- 
out some difficulty, as far'as a small rivulet about two miles 
to the east of the road. ‘The exact point of its termination 
has perhaps not been ascertained; but there does not seem to 
be any good reason for supposing that it is continued to the 
German Ocean, as no vestige of it has been seen in any part of 
the cliff where it might be expected to appear. 
[To be continued.] 
XXXV. Notices respecting New Books. 
HE First Part of the Second Volume of the Memoirs of 
the Astronomical Society has just been published, and 
the following are its contents: 
On the method of determining the difference of meridians, 
by the culmination of the moon. By Francis Baily, Esq.— 
On the utility and probable accuracy of the method of deter- 
mining the sun’s parallax by observations on the planet Mars 
near his opposition. By Henry Atkinson, Esq.—On the cor- 
rections requisite for the triangles which occur in geodesic 
operations. By Captain George Everest.—On the rectifica- 
tion of the equatorial instrument. By J. F. Littrow.—On the 
variation in the mean motion of the comet of Encke, produced 
by the resistance of an ether. By M. Ottaviano Fabrizio 
Mossotti.—Observations of the solstice in June 1823, made at 
Paramatta, New South Wales. By Sir Thomas Brisbane.— 
Observations made in the years 1823-4 at Paramatta, New 
South Wales. Transmitted by Major-General Sir' Thomas Bris- 
bane.—On a new instrument, called the Differential Sextant, 
for measuring small differences of angular distances. By 
Benjamin Gompertz, Esq.—Observations on some singular 
appearances attending the occultation of Jupiter and his satel- 
lites on April 5,1824. By Mr. Ramage, Captain Ross of the 
Royal Navy, and Mr. Comfield.—Observations on the occul- 
tation of the Herschel planet on August 6, 1824. By Capt. 
John Ross.—An account of the arrival and erection of Fraun- 
hofer’s large refracting telescope at the observatory of the Im- 
perial University at Dorpat. By Prof. Struve—On a new zenith 
micrometer. By Charles Babbage, Esq.—'The results of com- 
putations on astronomical observations made at Paramatta, in 
New South Wales, under the direction of Sir Thomas Brisbane, 
and the application thereof to investigate the exactness of ob- 
servations made in the northern hemisphere. By the Rev. 
Jobn Brinkley, D.D.—A short account of a new instrument 
for measuring vertical and horizontal angles. By George 
2E2 Dollond, 
