TABLE OF CONTENTS. 



CHAPTKR I 

 Prelum MARY observations Pago l 



CHAPTER II. 



TOPOGRAPHICAL SKETCH OF I HE STA1 E. 



iphical outlines, page 3. Division of the State into agricultural districts, 4 : Northern and Southern H 

 distr: Hudson and Mohawk district. ' \ Western 01 Wheal district, - Southern 



district, .■ . Atlantii district, l". Letter from 1). Tbon 



CHAPTER III. 

 i LIMA IK AM) TEMPERATURE OK THE STATE 



Letter from J. 11. Coffin, page ll. Variation <>l' temperature from difference of elevation, 13; from difference 

 latitude, 14. Kirwan's and Brewstcr'6 formulae for mean temperature, 10. Forwardness of seasons, 18. Climate 

 m island, 90; of the valley of the Hudson, 21 ; of the valley of the Mohawk, 23; of the region north and 

 northwest of the vail. ••! the region south and southwest of the valley of the Mohawk, 28 : 



of tin' western part of the State, 30. 



CHAPTER IV. 



AGRICULTURAL GEOLOGY. 



Soils derived from the decomposition of different rocks, page 33. Claa ition of simple 



minerals, 3'.). Character of granitic soils, 42. Drifted soils, 13 



CHAPTER V. 



THE TACONIC SYSTEM. 



General view of the Taconic system, page 15. Opinions of geologists on the Taconic and Cambrian systems, 40. 



■ 'ii river rocks, and Champlain division, 49. Rocks below and older than the 'laconic system, 52. Position 



and relations of the Taconic system, 54. Individual members of the Taconic system, 61 : Black slate, 03; Taconic 



date, 75; Stockbridge limestone, 78; Brown sandstone or Granular 

 quartz, S3. Rocks immediately above the I item, 87. Taconic system in Hhode-Island, 90. Taconic 



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

 products of the Taconic system, 105. Appendix to the Taconic system, 109. 



