Zi On the Inland Navigation of 



fection is its filtering mechanism through these hair-hke fila- 

 ments, that it rarely allows the escape of the nourishing par- 

 ticles diftused therein, although they be no larger than peas; 

 its food consisting chiefly of small medusae, Crustacea, and 

 zoophytes. 



(To be continued.) 



On the Inland JS'avigatlon of the United States of America, 



PART II. 



[Communicated by the Author. Continued from the Number for 

 January, 1828, Art. I.] 



The success that attended the execution of the Western Canal 

 of the state of New York, drew the attention of the inhabitants 

 of Philadelphia and Baltimore to the subject of Inland Navi- 

 gation, It was soon perceived that the trade of both these 

 cities was affected by the diversion of a considerable part of the 

 traffic of the country west of the mountains, to that new and 

 more convenient channel. Each of these cities, therefore, 

 entered eagerly into the search for channels equally advan- 

 tageous ; but these investigations have not been attended with 

 any consequences of important value. 



From Philadelphia three several routes have been examined ; 

 in one of these the summit is impracticable for want of a 

 supply of water ; the others involve an expense far beyond any 

 probable return, in consequence of the number of locks that 

 would be required to surmount the ridges. Hence it may be 

 asserted that there is little probability of the opening of an 

 entire canal from this city to the Ohio, or Lake Erie, although 

 there is a strong probabihty that a mixed system of canals and 

 railways will be successful. To this the legislature of the state 

 have very recently directed their attention, and have made large 

 appropriations for it. Two navigations, that will form import- 

 ant parts of such a system, have actually been completed. 



Philadelphia lies between two rivers, the Delaware and the 

 Schuylkill, which approach at that point to a distance less than 

 two miles. The former is navigable for the largest ships, the 

 latter for vessels of 100 tons. Immediately above the city the 

 Schuylkill is interrupted by falls, and although from its volume 



