Extracts from the Minute Book of the Geological Society . . 607 
from the land, and in many places breakers were observed to a 
great distance from the shore. In the strait the coasts on both 
sides are bold and rocky, and on the eastern coast there are numerous 
harbours. On the 21st of August, my lead being stolen out of the 
boat by some Indians, I was unable to take any more soundings. 
Specimens collected upon Lake Winipic. 
No. 17743, from a small rocky isle north of Blood river. Large 
grained granite, composed of white quartz, flesh coloured felspar 
and black mica. This granite is composed of larger grains than 
any that we found in the rivers below. It had numerous veins of 
quartz ramifying through it in various directions, though mostly 
running from north to south. 
No. 1 7744, from the west side of the lake near Buffalo island. 
A greyish fine-grained rock, consisting of quartz and mica, with 
some carbonate of lime. The veins in this rock were large and 
numerous, running north-east and south-west. 
Red River . On the 29th of August, our boats entered the 
Red river, by the largest branch, the mouth of which is narrow, 
and the banks on both sides of which are low and marshy, to the 
distance of about nine miles from the lake. The face of the 
country then changes, and the shores become more bold. The 
bed of the river is composed entirely of mud. The colour of the 
water is white. 
The appearance of the country in the vicinity of Pembina river, 
is quite flat, with little wood. Vast plains extend in every direction, 
having nearly a level surface. 
A single specimen, No. 17745, brought by Mr. Kerney from the 
banks of the Missouri, at the latitude and longitude above mentioned, 
consists of a blue compact porcellanic limestone. “ There is reason 
to believe,” observes Lord Selkirk, “ that limestone extends through 
Vol. V. 4 H 
