APPENDIX. 371 



observations are exposed, it is therein stated, that at 

 Macao on the 31st of December, 1811, the thermometer, 

 standing in its usual place in his room at Macao, marked 

 53° ; while another thermometer, placed in the open air 

 against a window, stood at 38°; and, though at 38°, yet 

 ice was found on the terrace of a neighbouring house, and 

 other terraces in the town. Both thermometers were also 

 placed with a south-east aspect, and therefore in a situation 

 to favour a high temperature. 



Again, in Kerr's Journal on the night of the 29th of 

 January, 1811, the thermometer at Canton in its usual 

 place on the ground floor, with a northern aspect and 

 in the open air, stood at 41° ; while another thermometer 

 placed on a platform elevated not more than thirty feet, in 

 the same pile of buildings, and not otherwise more ex- 

 posed, marked only 30°, and the next morning ice was 

 carried through the streets for sale. 



Also, in Mr. Bletterman's Journal, the thermometer 

 which marked the greatest heat was placed in the upper 

 story of his house at Macao, the roof of which was directly 

 exposed to the influence of the sun's rays : and the one by 

 which the greatest cold was observed, was placed in a 

 room on the ground floor. Thus, both thermometers 

 favoured extremes of temperature. 



Further, the Rev. Vicar-General Carpina of Fokien, 

 observes, that when the thermometer stood at 37° in the 

 vestibule of his house at Fogan, it froze in the fields ; and 

 speaks of having seen ice an inch thick. Now, if we estimate 

 27° as the lowest range of the thermometer, and 95° as the 

 highest, this would give a mean of 61°; and even taking 

 32° as the lowest, still that would furnish a mean of 

 63^°, whereas the mean of his journal is stated at 70°. 



Taking 29° as a mean latitude of the tea districts con- 

 nected with foreign supply (as correctly estimated by 

 Dr. Falconer), 61° may then, perhaps, be received as the 

 mean of the temperature. 



B B 2 



