IS 08- 4 " . Dr Richat4son's Remm'hs mi the Climate aitd 
. ' ■ T 
Table VI.— 
Means for the Month and 10 
days preceding the respective 
Phenomena. 
Highest Temperature 
observed within 10 
preceding days. 
Date. 
Mean Temp, 
of preceding 
month. 
Mean Temp, 
of preceding 
10 days. 
Means of 
Maxima for 
10 days. 
Means of Mi- 
nima for 10 
days. 
Phenomena. 
1820. 
May 20. 
+ 51.0 
+ 60.4 
+ 41.0 
+ 84° 
25. 
... 
• •• 
• •• 
• •• 
• •• 
Pine Island Lake clear of ice. 
28. 
... 
• •• 
• •• 
Prunus virginiana^ Primus pennsyl- 
31. 
+ 49.1 
+ 60.0 
+ 70.0 
+ 51.0 
+ 80 
vanica^ and Aronia ovalis^ flower- 
ing. 
The mean temperature of this 
month being only 49°, is nearly 
3° below that which Baron Hum- 
boldt considered necessary for the 
evolution of deciduous leaves ; 
but the influence of the direct rays 
of the sun was at this time very 
great, and the high temperature 
of the last decade of the month 
compensated for the defect of 
the first. 
In the course of the month of May, ground was prepared at 
Cumberland House ; and towards the end of it, barley sown, to 
foe reaped again in August, after an interval of about SO days, 
whose mean temperature may be stated at 67®. 8. This latitude 
is therefore well adapted for the cultivation of barley and of 
spring wheat. Maize ripens readily here, although it frequent- 
ly fails in the climate of Britain. At Edinburgh, for instance, 
in Lat. 56% where the mean temperature of the year is 47°.85 
and there are five months that reach a mean of 51°.8, maize 
rarely ripens except in very favourable situations, and under the 
shelter and reflection of a wall, because the mean temperature 
of these warm days does not exceed 55° 8, or 12° below the sum- 
mer temperature of Cumberland House. 
The great plains on the Saskatchawan and Bed Rivers, im- 
mediately to the north of the United States boundary line, are 
extremely favourable to the cultivation of the Cerealia, the crops 
seldom suffering from late frosts or heavy rains, and at a future 
period may provide for a redundant population. At Carlton 
