61 
the Colonia] wars, and the names of the 
places along its banks, such as Sorel, Ours, 
Chambly are those of officers of one 
the French regiments, who received the first 
land grants when these regiments were dis- 
banded. 
GEOLOGY OF MOUNT JOHNSON. 
Mount Johnson rises from the plain 22 miles (35 km.) 
east-southeast of the city of Montreal as the crow flies, 
and 25 miles (40 km.) north of the international boundary. 
The little village of St. Grégoire is situated near its base. 
The surrounding country is perfectly flat, forming a 
fertile and well tilled agricultural district, the nearest 
mountain being Rougemont, another of the Monteregian 
Hills, which lies some nine miles distant in a northeasterly 
direction. In cross-section Mount Johnson is approxi- 
mately circular. The igneous plug itself has at the base, 
immediately above the hornstone collar, a somewhat 
elliptical outline, and measures 3,500 feet (1066 m.) by 
2500 feet (761 m.), the longer axis having a direction 
N. 20° E. This gives the igneous intrusion an area of 
-423 of a square mile. The mean of a series of closely 
concordant aneroid readings, corrected by comparison 
with barometers at the observatory at McGill Univer- 
sity at Montreal, shows that the highest point of 
the mountain is 685 feet (208-8 m.) above the main 
street in the village of St. Grégoire opposite the 
church, that is, above the surrounding plain, or 875 feet 
(266-7 m.) above sea level, the plain here having an 
elevation above sea level of I90 feet (58 m.) It has a 
somewhat dome-like outline, and forms a very striking 
feature in the landscape. The slope on the southern side 
is steep, in places precipitous, while to the north it is more 
gentle. The accompanying photograph taken from the 
railway station near St. Grégoire, which is about a mile 
and a quarter distant from the mountain in a direction 
approximately southwest, shows this profile, as well as 
the little notch near the summit, caused by a ravine which 
passes down the side. 
At the foot of the mountain, more especially on its 
southern, southeastern and southwestern sides, are num- 
bers of large blocks which have fallen from the steep upper 
