APPENDIX, N" II. 
523 
The Oghera, full of stones, is not capable of 
any improvement. 
The Perz a, equally stony with the foregoing, and 
not to be made navigable without great expense. 
Yefcet is a considerable river, and might be 
navigated during high and middle water, 
were some stones removed, and cataracts 
improved : this plan is now in contemplation. 
Driza. During high water, in spring, some 
wood, for fuel, is floated down this river. 
Drizna has its soui'ce in some morasses in 
Livonia, is full of stones, and of no use 
whatsoever. 
Polatska is totally unnavigable ; and, even if 
improved at great expense, could never 
benefit trade. 
Oulla has for a long time been frequented-; 
thirty large barks go down from the town of 
Leppelaz ; timber and mast- wood is floated 
down, which were towed up the River 
Beresen (belonging to the Dnieper Division) 
as far as the Lake Beta, from whence they 
were transported by land to the Yessa : this 
falls into the Lake Belo, below the Leppel, 
whence the Oulla has its source. Upon exa- 
mination, after taking possession of Lithuania, 
near the spot where the land-carriage was 
made, it appeared practicable to effect a 
communication by water between the Lake 
