Meteorology, I5d 



momcter at which dew begins to be formed at the time. 

 *' The higher the point is, the gredter is the quantity and 

 force of vapour in the atmosphere ; and the lower it is, with 

 respect to the actual temperature of the atmosphere, the 

 greater is the force of evaporation." 



The dew-point may easily be found by cooling a body 

 until dew begins to form on its surface. In the hottest 

 summer months, fresh pump water will generally answer 

 the purpose; but, in winter, it will require to be cooled 

 below the temperature of the air, by means of salts ; equal 

 parts of sal ammoniac and nitre answer v-ry well. The eX'^ 

 periment slvnild always be made al an open window, where 

 there is a current of air. My observations were taken at noon. 



Mar. Mean Dew- Point, for 28 Days, 3lo Highest 470 Lowest I5» Range 3^0 



28 40 do. 54 do. 25 do. 29 



28 46 do. 55 do. 30 do. 25 



18 48 do. 56 do. 41 do. 15 

 22 54 do. 64 do. 44 do. 20 



19 54 do. C2 do. 48 do. 14 

 17 47 do. 58 do. 35 do. 23 

 15 49 do. 58 do. 41 do. 17 

 13 36 do. 46 do. 20 do. 16 

 17 34 do. 47 do. 21 do. 26 



Results of the Wind. 



N. - - - - 87 ] S. .... 18 



N. E. - - - 181 S.W. . . - 278 



E. - - - - 3S V/. - - . - 119 



S. E. - . - 57 I N. \V. - - ^ 210 



Total number of observations 083. 



The south west, north ea'nt, and norih west winds have 

 been the most prevalent. Mr. Dalton asserts, that. the two 

 former properly belong to the northern teioj^erate zone, 

 arising from the two general currents of the air tending; from 

 and towards the equator. 



The following will show which of the months were the 



most liable to high winds : the figures denote the number of 



days in each month on whith the highest winds v.ere ob- 



Berved : — 



Jan. Feb. March. Aoril. May. Ji-ne July. Aug. Sept. Oct. Nov. Dec. 

 2 5 5 5 8 3 o' 2 5 2 11 10 



Communications on metporologv d'rectcd (o Mr. Hanson, 

 at the above hospital, will be thankfully received. 



METKOno- 



