It IS interesting to inquire how tar the results thi 

 cord with previous general views on the subject, 

 have already intimated, are no where more fully c 



1 the memoir of 



conclusion of this paper, to test some of his positions by the pre- 

 sent observations. If they do not agree with his deductions, there 

 is doubtless inaccuracy in some one or other respects, while if they 

 on the whole correspond, a useful addition will be made to the mass 

 of facts in this yet imperfect science. 



He remarks that the Isothermal line of 50^ in N. America passes 

 near Boston, and founds this apparently in part, on observations 

 made at Ipswich and Cambridge, (Mass.) He also illustrates his 

 position, that there is a greater variety between the seasons in the 

 new than in the old world, by references to the latter place ; and 

 again, he states the mean temperature of America, east of the Al- 

 leganies, at various degrees of latitude, either by deductions from 

 " direct observations, or by interpolations between a great num- 

 ber of observations made in neighboring places and situated under 

 the same meridian."* Let us group these together and then com- 

 pare them with the present tables. 



34.00 

 30.02 I 73.40 



