- * 
174 Velocity of the Mississippi. 
19th.--A suite of minerals, consisting of petrifactions, 
agates, jaspers and madrepores from Antigua, was present- 
ed by Capt. Redmond. 
Mr. Halsey reported on the Kalankoe Pinnata of La- 
mark, which possesses the singular property of sending out 
gemmz from the dentations of the leaf, which take root and 
become new plants. 
3. Velocity of the Mississippi. 
To Professor Silliman. 
ing perpendicularly 1330 fee 
_ But even admitting the correctness of the hydrodynamic 
principles assumed by your correspondent, still is there not a 
great mitfake ip the estimate? For it is generallyknown that 
ter of a second ; in which case its mean velocity is 4 ft. per 
