C 346 ] 



XL. Journal of Meteorological Observations made in the 

 Garden of the Horticultural Society at Chiswick during 

 the year 1827. By Mr, William Beattie Booth, 

 A.L.S. 



Read February 19, 1828. 



In compliance with the resolution of the Garden Committee 

 of February the twenty-eighth 1825, the following Meteoro- 

 logical Journal has been kept in the Garden of the Society 

 during the year 1827. 



The same plan has been adopted in recording the obser- 

 vations, and the same instruments used in making them, as 

 those already described in the present volume of the Society's 

 Transactions, page 97. The only alteration that has taken 

 place, has been the removal of the thermometer for ascertain- 

 ing the temperature in the sun's rays to a space in the Ar- 

 boretum in which the other thermometers are situated ; the 

 former station, as mentioned in vol. vii. page 100, having been 

 considered objectionable on account of its being too near 

 a Garden wall, the radiation from which, as well as from 

 the border on which the thermometer stood, would naturally 

 cause a greater degree of heat to be indicated, than if it was 

 exposed under common circumstances. It is now placed 

 on the grass in the Arboretum about two inches from the 

 ground, and thus shews the maximum degree of heat to which 

 vegetation is exposed during the day, whilst the radiating 

 thermometer exhibits the opposite extreme in the same situa- 

 tion during the night. 



