Vegetable Productions of the Hudson s Bay Cmintries, W7 
Table VI. — Continued. 
Mean for the Month and 10 
days preceding fhe 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. 
April 7- 
Rooks seen to-day. 
9. 
... 
... 
... 
... 
... 
A merganser seen. 
10. 
... 
+ 25 0 
+ 35.0 
+ 15.0 
+ 49 
Willow catkins beginning to burst. 
12. 
... 
• •• 
... 
Geese and swans seen. Temp, in 
13. 
shade + 51°. Wind SE. 
Poplar catkins bursting. TSinp. 
14. 
+ 54°. 
Duck killed. Temp, in shade +62°. 
17. 
... 
Plovers, grackles, and orioles seen. 
18. 
Temp, in shade + 75°. 
Canadian jays and flycatchers seen. 
20. 
+ 50.C 
-f 60.5 
+ 40.9 
+ 75 
Highest temp, to-day + 38°, and 
at midnight , on the 19th the 
thermometer sunk to +21°. 
Tussiiago flowering. Highest tem- 
26. 
perature to-day +34°. 
Alder ( Alnus gluiinosa ) flowering. 
28. 
Temp. + 4G°. 
River Saskatchawan completely 
30. 
+ 34.0 
-j- 35.5 
+ 43.0 
+ 28.0 
+ 54 
broken up. 
May 1. 
• •• 
Anemone Liidoviciana flowering, its 
10. 
+ 38.0 
+ 46.2 
+ 29.6 
+ 67 
leaves not yet evolved. Mosqui- 
toes first seen, and in a few days 
afterwards severely felt — Sugar 
harvest commenced about 20th 
of April, and lasted till the 10th 
of May, shewing the period du. 
ring which the sap flowed freely 
in the sugar maple (Negundo 
fraxinifolium^ DeC.) The mean 
temperature of these two de- 
cades was + 36^° Fahr. ; but it 
is to be remarked, that the sugar 
boilers observe the flow of sap 
not to be so immediately influ- 
enced by a high mean tempera- 
ture, as by the power of the di- 
rect rays of the sun. Most sap 
is collected when a smart frost 
during night is succeeded by a 
warm sun-shining day. 
14. 
... 
... 
... 
... 
Sugar maple and gooseberry bushes 
flowering. 
Willows, gooseberries, and aspens 
17. 
• » • 
f • * 
• 
( Populus trepida)., in leaf. Va- 
ri'jus Drahce in flower. 
