40 



TABLES OF TEMPERATURE. — MASON. 



CHAP. Ill 



Dr. Mason's work furnishes the following data for the years 

 1834-1835 :— 



Mean daily and nightly range throughout the year. 



In the winter of 1847-8 the Rev. W. V. Harcourt made a 

 series of observations at a house near the Pontinha, about 

 eighty feet above the sea, which may be very advantageously 

 compared with a parallel series for the same period at Patj 

 observed by Professor Donkin. The following are the deduc- 



