10 LETTER FROM M. E. BOURGEAU. 
Various Observations on Temperature made at Carlton in 1858. 
re | |apmo 
o o 
May 16| Water of the river at 9 A.M. - | 40°7 | 330 
Glacier in a bog surrounded with poplar-trees : 
Under the ice towards the bushes of Salix ... | ... | 330 
Open side between the ісе and the earth ... | ... | 348 
Under the ice at the foot of the Salir ... ...| ... | 347 
Source of the bog ... e| | 576 
The bush of Salir had several catkins in 
flower.—The observations were made at noon. 
17, Апо ег bog situated beside the Populus on 
which I made my observations : 
Water of the bog at 10 A.M. ... m see | d 45°O | 457 
18| Water of the river... oe 413 | 35°8 
June 6| Poplar-bush, the leaves of which are twelve 
days later, at a depth of ... 3 4r o 
Towards the roots, at 2 inches in the earth.. e» | боо | 51°5 
Measurement of some of the largest Trees observed in the 
Neighbourhood of Carlton. 
Circumference in French métres. 
Métres. Centimétres. 
Populus balsamifera ............... ee 2 53 
Populus tremuloides.................. T" I 15 
Abies alba .................... eme estre 2 25 
Observed by Lieut. Blakiston, at Mosquito Point, on the Lower Saskatchewan, 
lat. 53° со’, long. 102° 53’:—Abies alba? 2 mètres, 58 centimètres. The largest 
remarked, after quitting Hudson's Bay, near the great rapid of the Saskatchewan, 
1 m. бо cent. 
Observed by myself in the Valley of Arches in the Rocky Mountains :—Abies 
nigra? 4 m. 69 cent. nearly; height about 160 feet. Most of the forest-trees had 
nothing remarkable in their size, the too frequent burning of the forests forming 
an impediment to the development of their beauty. 
А few Observations on the Temperature of the Earth in the 
Prairies of the Saskatchewan. 
| | Atm 
| Depth. | sphere 
1858. А | 
Aug.23 | At the base of the Rocky Mountains... ... 3 4rs | 58°0 
24 | At 9 A.M. eee - see id. 42°0 | §5°0 
27 | Onthe Prairies of the ‘Saskatchewan... e. |42 | 590 
o » » » 440 60°0 
Sept 2 ” » » 47'0 38 5 
7 » » » . 45°0 40°5 
9 ” ” ” 46°0 39°0 
10 » » » 46:0 40'0 
14. ” ” » oe б 452 47 5 
