29? On the Inlahd Navkjation 



when there was not a sufficient quantity of muriatic acid to 

 decompose the whole of the manganese, a httle oxygen. 



Mr. Mac Mullen makes some observations on the common 

 fulminating powder, to infer, that when it fuses, the carbonic 

 acid of the salt of tartar and the nitric acid of the nitre com- 

 bine, and form chloric acid, which then detonates with the 

 sulphur. 



The proof he brings of this, is, that there exists a general 

 rule that all detonating compounds contain azote, and as chlorate 

 of potash is considered not to contain nitrogen, he does away 

 with every objection, by considering chlorine as a compound of 

 oxygen, carbon, and nitrogen. 



With regard to this opinion I will not make any remark, as 

 I am at present engaged in some rather elaborate researches 

 on that substance, the insertion of which here would take up 

 too much space. I shall conclude, therefore, by hinting to 

 Mr. Mac Mullen, that although '* analogy has its use of con- 

 necting facts together, and guiding us to new experiments, yet 

 when totally unsupported by exact experiments, it certainly 

 should not be carried so far." 



On the Inland JVavigation of the United States. 



[Part III.] 



In the State of New Jersey, the only work of any note is the 

 Morris Canal. The object of this navigation is, to form a 

 communication between the upper waters of the Delaware and 

 the city of New York, The Delaware is navigable, above the 

 Falls at Trenton, for vessels carrying from ten to twelve tons. 

 These descend, by the force of the current, loaded, and are 

 carried back empty, or with small loads, by the aid of poles. 

 The Lehigh, a branch that joins the Delaware at Easton, is 

 also navigable in the same manner. More recently, improve- 

 ments have been made in these navigations, that will be 

 mentioned in their proper place. By the improvement of the 

 latter river, coal, from the great anthracite formation in Penn- 

 sylvania, descends to Easton, and, when the Morris Canal is 

 completed, will be enabled to proceed to New York. This is 



