-1830] WRITINGS OF JOSEPH HENRY. 35 



Seneca lake, and thence with the discharged waters of this 

 reservoir, to the gulf of St. Lawrence. On the summit level 

 of the Champlain canal, the waters of the upper Hudson are 

 turned back to the north, and instead of mingling, as form- 

 erly, with the Atlantic ocean in the bay of New-York, now 

 mix with the sea in the straits of Bellisle. 



Note. — For the accompanying plate of the comparative 

 elevation of the principal mountain ridges and peaks in this 

 state, w^e are indebted to the politeness of David H. Burr, 

 Esq. It forms a part of a general map of the state, which 

 together with an atlas containing a map and statistical 

 table of each county in the state, has just been published by 

 the above named gentleman. 



This work is an important acquisition to the topographi- 

 cal knowledge of our state; and as it is intimately connected 

 with the subject of the preceding article, the following ex- 

 tracts from the author's preface may not be improper in this 

 place. •' The legislature of New- York, in 1827, upon the 

 recommendation of Governor Clinton, passed an act direct- 

 ing that whenever a set of maps was compiled on this plan, 

 and delivered to the surveyor-general and comptroller, they 

 should revise and correct the same; and that when they 

 were satisfied with their accuracy, should publish them at 

 the expense of the state. The legislature at the same and 

 subsequent sessions, made liberal appropriations to defray 

 the expenses, at the same time giving the author permission 

 to make use of all documents dejDosited in any of the public 

 offices of the state, or of the several towns and counties, 

 which he should deem necessary in the completion of the 

 work." 



" During its progress, the surveyor-general addressed cir- 

 culars to the supervisors of the several towns, requiring them 

 to furnish surveys of the same, that their boundaries might 

 be correctly described in the revised statutes. The informa- 

 tion so obtained was furnished by the surveyor-general to 

 the author, and has been used in the present work. When. 



