Dr. Berger on the Isle of Man, 61 



If we rate at 50° Fahr. the mean annual lieat in the Isle of Man, 

 we shall have it differing from that of London merely by 1° for a 

 difference of 2%4I' of north latitude. Comparing the same annual 

 heat of the Isle of Man with that of Edinburgh, we shall find it 

 surpassing the latter by 2°, 2' Fahr. though the latitude of the Isle of 

 Man be only 1%45' more to the south than that of Edinburgh. 



The mean temperature of the month of June, 1811, in the Isle 

 of Man, deduced from 128 thermometrical observations, I found to 

 be 55°. 81' Fahr. but as most of the observations were made on 

 the tops of mountains, the mean must be lower than it would have 

 been had the observations been made in the plain. Thus I find 

 that thirty-nine thermometrical observations (out of the series of 

 128) made by the sea side give for the mean 57°. 37', which when 

 compared to the mean of 22 thermometrical observations made at 

 the apartments of the Royal Society on correponding days, is 

 deficient by 4°. 35'. The London mean being 61°. 72', and that 

 of the Isle of Man 57".37'. At Belfast the mean is 64°.90' Fahr. 

 The mean height of the barometer for the same month of June, 

 1811, is as follows. 



London - - 30.13295 



Isle of Man - 30.11895 

 The frosts are short in the Isle of Man, and the snow does not 

 lie long on the ground, especially near to the sea. I was informed 

 by the Rev. Mr. William Fitz Simmons, that on the top of Snei- 

 feldt it does not remain longer than two or three weeks, from 

 Christmas generally, to the second or third week of January. 



