28 



REPORT 1853. 



and sink twice to minima about 4 a.m. and 4 p.m., Mr. Lawton referred to the 

 observations, to see how far such ebb and flow of the mercurial column was borne 

 out. In his own observations taken at 9 a.m. and 6 p.m. there was no evidence of 

 such fluctuation ; but in the Philosophical Society's Register taken at the time of the 

 greatest ebb and flow, the mean of the morning readings in each month of the yeai- 

 is in every case above the mean of the afternoon readings, as will be seen by the 

 following Table. 



Table II. 



From observations on atmospheric pressure we pass to those on its temperature, in 

 illustration of which the following Table (III.) has been constructed. The first 

 four columns are the results of four years' observations, from 1849 to 1852. The 

 second four columns are Dr. Fielding's observations, from 1831 to 1836 ; to these are 

 added a third table, copied from Professor Phillips's recent work on the Mountains, 

 Rivers, &c. of Yorkshire, giving the average highest daily and lowest nightly tem- 

 perature for each month at York, from 1812 to 1818 inclusive. 



Table III. — Temperature. Average Daily Maxima and Minima. 



A comparison ot these three tables shows during the summer months considerable 

 uniformity ; but during the colder months of the year the effects of the German 

 Ocean and of the Humber in raising the sea temperature are manifest. This compari- 

 son of temperature between Hull and York would have been more satisfactory had 

 the observations been made during contemporary years. 



