330 _ Meteorological Observations at Montreal. 
The. following are all the instances in which an inch of rain 
has fallen in sities Iie four hours. 
: . te. Amount. | Tim | Amount} 
1839. ia 12,| 1.094 12 hs. 1840. Feb. 20-23, | 4.017, “lis? 
13,| 1.001) 1.¢ March oA, 2.109 24 hs. 
21,| 1.255 |10 f’ ia Be 29, | 1.636 /24 
Sept. .15,| 1493/24 “ June . 22,/1.168) 9 “ 
Nov. 14-15,|2.615 36 “ July 23, 1L.012)12 * 
|1840. Feb. 9,| 1.058 12°“ Nov. 22,/1 .263 24 
_ Throughout, aha, entire preceding discussion, I kav’ aia 
ns of different hours. The propriety 
a this course hast trust been. made sufficiently apparent. Al- 
most every meteorological phenomenon has a diurnal inequality. 
Thus the heights of the barometer, thermometer and hygrome- 
ter, direction and force of the wind, character and amount of the 
clouds, as well as the amount of rain, change sensibly with the 
hour of the day. I trust that heat will no longer be considered 
as an unimportant agent in the modification. of meteorological 
phenomena ; and that hereafter, in publishing sone 
means, the distinction of hours will not be disregarded. — 
observer who publishes the mean of all his renee 
servations without regard to. hours, not. only cannot be su 
obtaining the mean temp f his locality ae it sesgeonetn 
ers of t the data n essary. for eagles 
“i al ti ee ee, 
ay - . % Sa 4 
~ Nye hee ‘ be tr. ae he “oO k ete ee, SR Be ey 
a ‘ sei ‘ i‘ haa a Fe a ie eS 
phen Alea a me ‘ . ee, 
ae ees 
Ane. sictiesecs ies coueghabe Shoninleng of the acne: lll 
» Province of Canada, in Lat. 45° 30’ N., Lon. 73° 22 W: 
(or five years, from 1836 to 1840, inclusive ;) from regis 
ters kept by J. S. M’Corp, Associate’ Mem, Lond. Met: Soe 
Mem. Nat. Hist. Soc. Montreal, Cor. Mem . Lit, and Hist. Soe 
prmperigie: tangs! Tpesltat edie souse li ee 
oe ANNUAL 2 TEMPERATURE. 
Et 
* OF this, 2.838 fell in thirty six“hours. ~ 
