APPENDIX, N° II. 
463 
Robrihy ', answerable to the depth of the bed 
of the Don. Why a work thus far advanced 
was abandoned, is not known ; some supposed 
it was for want of water; but the situation 
of the Vale of Robrihy confutes this statement, 
as being capable of becoming an immense 
receptacle of water, and quite sufficient for 
this navigation. The hydrography of this 
place will, however, not admit the navigation 
of vessels of greater length than ninety feet, 
fourteen feet of breadth, and drawing three 
feet of water, with a full lading. The other 
plan proposed, of joining the Don and the 
Volga by means of the Kamisliinka and the 
Hqfla, proved abortive : though actually begun, 
an insufficiency of water was apparent. The 
reservoir was intended to be placed at the 
sources of the Kamisliinka ; but they were 
found hardly sufficient to supply the common 
stream of the river. The Hqfla being fifty feet 
higher than the level of the Volga, could furnish 
a reservoir of water (point of separation in the 
original): yet, even with this advantage, the 
navigation must be carried on in caravans, 
or in large collective bodies of barks ; other- 
wise the passage will not be effected, for want 
of water. 
(!) Better expressed by the name of the Hollows of liabi lity. 
