﻿CONTENTS OF PART I, 



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NEW YORK 

 BOTANICAL 



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I. On the Practicability of Constructing Cannon of Great Caliber, capable of endur- 

 ing long-continued Use under full Charges. By Daniel Treadwell. . . 1 



II. The Age of Petronius Arbiter. By Charles Beck. ...... 21 



III. On the Use of Equivalent Factors in the Method of Least Squares. By George 



P. Bond, A. M 179 



IV. JMagnetic Observations on the Boundary Line between the United States and Mex- 



ico, made in 1855, under the Direction of Major W. H. Emory, United States 

 Commissioner under the Treaty of 1853 ; and General Discussion of the Magnetic 

 Observations made in Connection with the Mexican Boundary Surveys. Recom- 

 puted by J. E. Hilgard, U. S. Coast-Survey. (With a Map.) .... 213 



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