94 MEMOIR ON BOSTON HARBOR. 



plan for the general improvement and protection of the harbor may be the subject of a 

 future commnnication. 



In the preparation of this Memoir I have only consulted my associates in the Academy. 

 I have no connection with any private enterprises of construction and improvement. 

 I represent no parties concerned in them. 



For the views here expressed I have no other responsibility than that which apper- 

 tains to me as a member of this Academy ; and this responsibility demands that I should 

 make no statement of facts that do not appear to be well authenticated, present no gen- 

 eral views except such as are authorized by a fair and reasonable induction, and advance 

 no principles that are not admitted or easily proved. 



The Comparative Condition of Boston Harbor. 



The charts and surveys consulted or made known to me, in the course of the prepa- 

 ration of this memoir, are the following : — 



1. Carte du Port et Havre de Boston, avec les Cotes adjacentes. Par le Chevalier de 

 Beaurain. 1776. This is a military survey, and is based on an English survey. 



2. Part of Boston Harbor, by Henry Pelham. Mil. This also is a military survey. 



3. Carte particuliere du Havre de Boston, avec les Sands, les Bancs de Sable, les 

 Roches, les Amaies, et les autres Directions utiles a la Navigation. Reduite de la Carte 

 Anglaise de I. E. S. Des Barres, Ecuyer. Par le Marquis de Chabcrt. 1780. This chart 

 is topographical and h3'drographical. 



4. The chart of Des Barres in the second volume of the Atlantic Neptune, 1775, 

 from which I imagine all the preceding have been taken, whether admitted or not ; while 

 Des Barres's own chart is partly composed of a survey of the harbor by Mr. Callender, 

 a master in the Royal Navy, in 1659. 



5. The Chart of Boston Harbor, by Commodore Wadsioorth. 1817. 



6. The chart made under the direction of commissioners appointed under the re- 

 solve of March, 1835. 



7. The chart prepared by the Coast Survey, at the request of the commissioners ap- 

 pointed by the resolve of April 16, 1846. 



8. To these might be added several others that are taken more or less from the pre- 

 ceding, and have but little original merit or value, with the exception perhaps of one in 

 the possession of Mr. Thomas Richardson of Boston, entitled, A Cliartofthe Harbor of Bos- 

 ton, ivith Soundings, Sailing-marks, ^c. Taken from Holland^s Surveys. Carefully re- 

 vised and corrected by Osgood Carlton, Esq., Teacher of Mathematics, Boston. London, 

 published by I. P. W. Des Barres, Esq. Boston, republished and sold by W. Newman, 

 Book and Chart Seller. 



