Dr Ferry on the Climate of the United States. 



73 



Witli these preliminary remarks, we are prepared to enter 

 inte a detail of the numerical results furnished in the several 

 systems of climate pertaining to the United States. The 

 military posts furnishing the thermometrical data will conse- 

 quently be classified as under — 



General divisions of 

 the United States. 



1. Northern. 



2. Middle. 



3. Southern. 



Systems of climate. 



1st Cla.ss. — Posts on the Coast of New England, 

 extending as far south as the har- 

 bour of New York. 



2d ••• Posts on the northern chain of lakes. 



3d ••• Posts remote from the ocean and in- 

 land seas. 



1st Class. — Atlantic coast, from Delaware Bay to 



Savannah. 

 2d ••• Interior stations. 

 1st Class. — Posts on the Lower Mississippi. 

 2d • • • Posts in the Peninsula of East Florida. 



These general divisions, intended as well to facilitate de- 

 scription as to express the operation of general laws, may be 

 regarded, in a great measure, as arbitrary. The northern 

 embraces a region characterized by the predominance of a low 

 temperature ; in the southern, a high temperature prevails ; 

 while the middle exhibits phenomena vibrating to both ex- 

 tremes. Each of these general divisions, as exhibited in 

 the table above, is subdivided into well marked classes or 

 systems. 



As the present paper will not allow the admission of ex- 

 tensive tables of figures, the writer is obliged to confine him- 



