TEMPERATURE. 
In t 28th of February in tbe year 1825, the Garden Committee of 
he lyal Horticultural Society resolved that it was expedient that a 
fete ological Journal should be kept at Chiswick in the gardens of 
ae biety; and observations were commenced on the 1st of May, but 
’om he difficulties experienced in obtaining efficient instruments and 
theiCircumstances the observations to the end of the year were not 
ansi red to be sufficiently perfect for publication. 
Fn the 1st day of January 1826 to the 31st day of December 1869, 
owesr, the observations were made upon one uniform plan through- 
atjjll June 1830 by Mr. William Beattie Booth, A.L.S., and from 
fiat ite, with but few exceptions which are not specified, by Mr. 
lobe Thompson, under-gardener in the fruit department. 
Th observations during the whole of this period of 44 years have 
een ade at three different times in the day, designated in the journals 
s m( ling, noon, and night; and included the readings of the barometer, 
empjature of the air and either a Daniell’s hygrometer or a wettened- 
ulb lermometer as well as maximum and minimum temperatures 
bth ilar and terrestrial readings, fall of rain, direction and strength 
ftb vind hy estimation, and brief notes. 
Tt morning observations are stated to have been made at 6 o’clock 
a tb summer months, and at daybreak in the winter months; the 
Mm bservation was made between noon and 1 p.m., and the night 
bse:ffion between the hours of 9 p.m. and 10 p.m. 
hi'ie reduction of the observations I have considered the morning 
bseution to have been made at 6 o’clock a.m. in the months of April 
o ^gust; at 6.30 a.m. in the months of March, September and 
)ct o r; at 7 a.m. in the months of February and November; and at 
AMjin the months of January and December ; that the noon observa- 
lonsjave been made midway between noon and 1 p.m., and the night 
delations at 9.30 p.m. throughout the year. 
Cc iidering that temperature is the most important meteorological 
hm t bearing upon all animal and vegetable life, and also considering 
'hat jie science of open-air horticulture needs a full knowledge of the 
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