96 
annual volumes of the Radcliffe Observatory, Oxford, which 
are derived frombi-hourly observations with aself-registering 
anemograph. This instrument was first mounted in July, 
1856, at a height of 22 feet from the ground; but was 
removed in August, 1858, to a station at the top of the tower 
of the Observatory, at an elevation of 110 feet, where it has 
since remained. The results derived from its indications 
are given in the annual volumes of the “ Radcliffe Observa- 
tions,” in three tables, numbered XII., XIII., and XIV. 
Table XII. shows the “Mean Monthly Directions of the 
Wind every Two Hours;” Table XIII. the “Mean Bi-horary 
Velocities of the Wind for each Month, estimated in the 
Directions given in Table XII.;” and Table XIV. the 
“Actual Mean Monthly Bi-horary Velocities.” Up to the 
end of 1858 the mean monthly directions were determined 
without regarding the velocities ; but in reducing the obser- 
vations of 1859, the present director, the Rev. Robt. Main, 
F.R.S., took account of the velocities in determining the 
mean directions, and this method has been used through the 
succeeding years ; and, as it is undoubtedly more correct than 
that employed by the late Mr. J ohnson, I have omitted from 
my discussion the results obtained in the years 1856-58. 
The following Table I. contains the mean bi-horary direc- 
tions of the wind extracted from Table XII. of the annual 
volumes of the “Radcliffe Observations;” and Table II. 
contains the corresponding mean velocities in miles taken 
from Table XIII. 
Table I. 
Oh. 
2h. 
4h. 
6h. 
8h. 
lOh. 
12h. 
14h. 
1 
16h. 
18h. 
20h. 
22h. 
1859 
241° 
244° 
237° 
231° 
231° 
226° 
230° 231° 
225° 
232° 
232° 
235° 
1860 
249 
254 
252 
253 
249 
250 
252 
247 
247 
250 
245 
257 
1861 
234 
230 
227 
233 
224 
228 
232 
'232 
232 
230 
231 
240 
1862 
234 
235 
234 
232 
227 
231 
228 
229 
229 
235 
229 
233 
1863 
225 
226 
229 
222 
226 
218 
218 
217 
213 
214 
219 
219 
11864 
206 
211 
208 
200 
189 
187 
189 
196 
202 
198 
206 
201 
1865 
198 
204 
195 
193 
187 
188 
190 
i 
196 
194 
200 
i 
202 
198 
