1836.] 



Notices of Books. 



159 



It is desirable that continued observations should be made, here and 

 elsewhere, to verify these results, as it is only by numerous as well as 

 accurate observations that we can ever hope to detect the law which 

 these variations follow. 



The mean temperature and pressure from twenty-five years observa- 

 tions is as follows : 



Inches. 



Barometer 29.964 



Thermometer 81,700 



and the mean monthly range, &c. during twenty-five years, between 

 1796 and 1821, is thus stated : 



Months. 



January. . . 

 February... 

 March ... 

 April.. 



May 



June 



July 



August 



September. 



October 



November. 

 December- 

 Mean.. 



Mean monthly height for 21 I Mean fall of rain for 13 

 years between 1796 & 1821. years between 1803 & 1821. 



Barometer. 



Thermometer 



Including the 

 whole fall 

 during 

 storms 



Inches. 

 30,085 

 30,076 

 30,041 

 29,955 

 29,851 

 29,861 

 29,887 

 29,879 

 29,908 

 29,942 

 29,956 

 30,074 



Degrees. 

 75,168 

 77,157 

 79,920 

 82,417 

 86,918 

 88,159 

 85,645 

 84,732 

 83,825 

 81,858 

 78,672 

 78,843 



Inches. 

 0,608 

 0,127 

 0,538 

 0,384 

 1,419 

 0,646 

 3,303 

 3,552 

 4,824 

 11,294 

 14,803 

 8,618 



29,958 



Fall in storms 

 reduced to 

 the Mean 

 fall. 



Inches. 

 0,608 

 0,127 

 0,538 

 0,384 

 0,121 

 0,746 

 3,303 

 3,552 

 4,824 

 11,294 

 14,803 

 6,048 



81,693 



50,124 



46,348 



From the above table it would appear, that the Barometer arrives at 

 its maximum 30,085 inches, some time in the month of January ; and 

 that from this date to the beginning of May, it gradually descends 

 towards the minimum 29,851 inches — quitting this it continues gra- 

 dually to ascend again, until in January it has again reached the maxi- 

 mum — We notice that the Thermometer follows as nearly as 

 possible an inverse order to this, it being at the minimum from the 

 means of 25 years observation, on the 9th of January, and at the maxi- 

 mum on the 7th of June ; the maximum temperature in the shade when 

 sheltered from the hot land wind is 107° , but when not so sheltered it 

 has occasionally reached 115° — 120°. 



