REPORT ON PLANTS GROWN AT CHISWICK. 
169 
high, covered throughout the season with a profusion of closely- 
set, attractive-looking flowers, which are of a deep yellow with 
maroon crimson spots. 
T. compactum svJphureum was similar in character, hut the straw- 
yellow spotted flowers were not quite so freely produced. T. 
compactum scarlet was a trifle stronger in growth, but a free- 
blooming compact orange-scarlet. 
XXX. On the Winds at Chiswick and Barnsbury during 1873. 
By E. Strachan, P.M.S., Meteorological Office. 
The distance apart of these two stations is trifling, but the winds, 
as observed at them by two difi'erent observers, may be compared 
with the view of showing the reliance that can be placed upon eye 
observations of wind, and pointing out the value of the method of 
reduction. 
Let it be granted that a single observation daily affords a general 
estimate of the course of the atmospheric current during each day, 
then it must be allowed that the resultant of a month's observations 
must give a tolerably correct idea of the course of the air during 
that period. So also the resultant of the monthly resultants will 
approximate to the actual course of the wind during the year. 
The resultant direction and force of the wind has been cal- 
culated from the wind observations by summing the estimated forces 
under each direction, according to the method for computing a 
mechanical resultant on the principle of the composition of forces. 
This assumes an equality between the units of the arbitrary scale 
for force, namely 0 to 12, which is not theoretically correct, though 
probably the resultants are as reliable as each single estimate of the 
force of wind by personal impression. The results are as follows : — 
Periods. 
Chiswick. 
Barnsbury. 
Direction. 
Force. 
Direction. 
Force. 
January- 
S 16° W 
.. 1-6 
S610W 
2-7 
February ... 
N 
.. 1-5 
N20E 
1-1 
March 
NE 
.. 0-6 
N51E 
0-5 
April 
N 11 E 
.. 1-9 
N22E 
1-1 
May 
N35 W 
.. 0-9 
. N71W 
0-9 
June 
S73 W 
.. 0-6 
w 
0-6 
July- 
S33 W 
.. 2-2 
. S 69 W 
2-0 
August 
SW 
.. 3-0 
S72W 
1-9 
September ... 
S 60 W 
.. 1-4 
W 
11 
October 
S40 W 
1-1 
S 82 W 
1-1 
November ... 
S 68 W 
... 0-1 
.. N51W 
0-6 
December . 
S 53 W 
... 1-2 
S76W 
1-4 
Year 
S64 W 
... 0-65 
w 
0-86 
