158 eedings of the British Association. 
trum, Mr. Dollond has constructed for me some important pieces 
of apparatus for directing and condensing the solar rays; and I 
have recently obtained from Mr. Herz, of Munich, a very large 
prism, to be used with the telescope, and a series of smaller prisms 
for constructing a prismatic cylinder for the purpose of expanding 
or magnifying particular parts of the spectrum. 
Prof. Whewell stated that the times of high water on the east 
coast of Britain, and the north coast of Belgium, Holland, and 
Germany, had led him to the conclusion that there must lie to- 
wards the middle of the German Ocean, a central space, in which 
the rise and fall of the tide vanishes. \ He presented a letter writ- 
ten by Capt. Hewett, who was lost in H. M. S. Fairy, in the 
German Ocean in 1840. Capt. H. had endeavored to decide the 
point by a-series of observations, the details of which are given 
in ine letter, and afford strong confirmation of the views of Prof. 
Whewell. 
Mr. J. Scott Russell read a Notice Supploneentanep to the Sirinee 
Report on Waves, a results of experiments made during 
the year. 
Mr. W. S. Harris communicated a report on the working of 
Whewell’s Anemometer at Plymouth during the year past. He 
exhibited the curves for the year on a diagram twelve feet high 
by seven wide, a red tape line showing the total effect. ‘he 
instrument, after having undergone certain improvements, appears 
now to be entirely satisfactory. ‘The mean result of the year’s 
andorra shows at Plymouth an annual movement of the air 
from the 8. S. E. toward the N. N. W. nearly. If we connect 
this fact with the results obtained from the hourly meteorological 
observations at the Dock-yard, we are entitled to say, so far as 
our experiments extend, that there is an annual movement of the 
atmosphere in this latitude towards the north, under a mean pres- 
sure of 29.9 inches nearly, taken at the level of the sea, anda 
mean temperature of 52° Fah. Having traced an annual move- 
ment in the air, it remains to determine its rate of motion. ‘This, 
although at first sight a difficult matter, he hopes to accomplish 
by a mode of experiment now in progress. 
Further Researches on Rain, by John Phillips, and at Harraby, 
near Carlisle, by Joseph Atkinson, Esq. At previous meetings 
of the PR. Mr. P. had offered a series of experiments on 
the sipiak:hocacetst exces} ntdilier 
s ee eees Baw ee: 
