TABLE OF CONTENTS. 



CHAPTER I. 

 Pbeliminahv observations • • • •• "^o*^ 1 



CHAPTER II. 

 TOPOGRAPHICAL SKETCH OF THE STATE. 

 Topographical outlines, page 3. Division of the State into agricultural districts, 4 : Northern ami Southern HighUuid 

 districts, •l&.'i; Eastern district, G; Hudson and Mohawk district, 7; Western or Wheat district, 8; Southern 

 district, y; Atlantic district, 10. Letter from D. Thomas, 8. 



CHAPTER III. , 



CLIM.VrE AND TEMPERATURE OF THE STATE. 



Letter from J. H. Coffin, page 11. Variation of temperature from difference of elevation, 12; from difference of 

 latitude, U. Kirwan's and Brewster's formulee for mean temperature, 16. Forwardness of seasons, 18. Climate 

 of Long island, 20 ; of the valley of the Hudson, 21 ; of the valley of the Mohawk, 23 ; of the region north and 

 northwest of the valley of the Mohawk, Sij ; of the region south and southwest of the valley of the Mohawk, 28 ; 

 of the western part of the State, 30. 



CHAPTER IV. 



AGRICULTURAL GEOLOGY. 



Soils derived from the decomposition of different rocks, page 33. Classificalioii of rocks, 30. Composition of simple 

 minerals, 3D. Character of granitic soils, -12. Drifted soils, 13. 



CHAPTER V. 



THE TACONIC SYSTE.M. 



General view of the Taconic system, page 4.5. Opinions of geologists on the Taconic and Cambrian systems, 4i3. 

 Hudson river rocks, and Champlain division, 49. Rocks below and older than the Taconic system, 52. Position 

 and relations of the Taconic system, .'54. Individual members of the Taconic system, 61 : Black slate, 63 ; Taconic 

 slate, 65; Sparry limestone, 72; Magnesian slate, 75; Stockbridge limestone, 78; Brown sandstone or Granular 

 quartz, 83. Rocks immediately above the Taconic system, 87. Taconic system in Rhode-Island, 90. Taconic 

 system in Maine, 94. Taconic system in Michigan, 101. Derangements of the Taconic system, 102. Mineral 

 product* of the Taconic system, 105. .•\ppendi.\ to the Taconic system, 109. 



