334 



THE CANADIAN NATURALIST. 



[Vol. vi. 



METEOROLOGICAL RESULTS FOR MONTREAL 



FOR THE YEAR 1871. 



By Charles Smallwood, M.D., LL.D., D.C.L., 



Professor of Meteorology in the University McGill College, 



Montreal. 



The following observations extend over the past year, 1871, 

 and are reduced from the records of the Montreal Observatory, 

 Lat. 450 36^^ 17.41s Long. A^ 54°^ 17^ west of Greenwich. 

 The cisterns of the Barometer ar3 182 fest above mean sea level. 

 The whole of the readings are corrected for any instrumental 

 errors, and the observations of the Barometer are corrected and 

 reduced to 32^ F. 



Atmospheric pressure. — The highest reading of the Barome- 

 ter occurred at 10^ 30^ p.m., on the 25th day of January, and 

 indicated 30,985 inches ; the lowest reading was at 2^ 25°^ p.m., 

 on the 18th day of February, and was 29,050 inches, giving a 

 range during the year of 1.935 inches. 



The following table has been compiled to show the highest 

 and lowest readings, also the monthly mean and monthly range 

 in inches and decimals of an inch : 



Temperature of the Air F*^. — The highest reading of the 

 Thermometer during the year was on the 13th July and was 95°. 

 The lowest was on the 5th February and was 28° (below zero), 

 giving a yearly range or climatic difference of 123°. The mean 

 temperature for the year was 44.53, which is 2.23 degrees higher 

 than the Isothem for Montreal deduced from observations ex- 

 tending over a long series of years. 



The first frost of autumn occurred on the 8th September. 



