State of New York, to study the salt deposits for the 

 benefit of those of Onondaga County. 



In 1853 he was called to the Chair of Chemistry and 

 Natural Sciences in Rutgers College, at New Brunswick, 

 and retained his connection with the College during his 

 life. He had already received the degree of Doctor of 

 Philosophy from the University of New York, and in 1865 

 Union College conferred upon him that of Doctor of 

 Laws. 



In 1854 he was appointed Assistant Geologist of the 

 State of New Jersey, and was in charge of the southern 

 division of the State for three years. At this time he 

 made reports on the green-sand marl beds, the clay beds 

 and on the coast changes. The fact of the subsidence of 

 the coast, and the stratigraphical relations of the marl 

 beds were discovered by him at this early day. The 

 geological survey was suspended from 1856 till 1863, 

 when the Legislature put the property of the survey in 

 his charge, and in 1864 he was made State Geologist by 

 act of the Legislature, which by nearly unanimous votes 

 in 1872, 1876, 1880 and 1885 continued the survey with 

 Doctor Cook at its head. 



In 1864 Doctor Cook used his influence successfully to 

 connect the " State College for the Promotion of Agricul- 

 ture and Mechanic Arts " with Rutgers College, and he 

 was made Vice-President of the combined institution. 

 In 1873 he lent his aid in the formation of the State 

 Board of Agriculture, and was ever after a member of 

 its Executive Committee. 



In 1877, at the Wilkesbarre Meeting of the American 

 Institute of Mining Engineers he read a paper on ''The 

 Southern Limit of the Last Glacial Drift across New 

 Jersey and the Adjacent Parts of New York and Penn- 

 sylvania." He was one of the first to discover the exist- 

 ence of a great terminal moraine in the eastern United 



