232 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



University, and with the different colleges of the state and 

 the normal schools, provided an application be made to the 

 chief geologist before the commencement of the field work. 

 The service is to be completed within four years of the time 

 of its commencement. 



DR. GENTH ON CORUNDUM. 



An important memoir, constituting No. 1 of the Contribu- 

 tions from the Laboratory of Pennsylvania, has lately been 

 published by Dr. F. A. Genth upon corundum, its alterations 

 and associated minerals. 



REPORT, FOR 1873, OF THE STATE GEOLOGIST OF NEW JERSEY. 



The annual report of the state geologist of New Jersey for 

 1873, which has just appeared, contains a notice of the work 

 done by Professor Cook, the chief geologist, and his assist- 

 ants. This embraces the result of surveys of various por- 

 tions of the state for the purpose of determining their min- 

 eral products, the survey of the northern boundary of the 

 state, and various measures connected with the drainage of 

 submerged lands. A geological map, on a large scale, of the 

 northern half of the state accompanies the volume, and forms 

 a valuable contribution both to the geology and geography 

 of New Jersey. 



Professor Cook calls attention to the extensive use made 

 during these surveys of the dipping-needle, for determining 

 the location of concealed beds of iron ore ; this, in his opinion, 

 being a valuable adjunct, and capable of practical application. 



GEOLOGICAL SURVEY OF LOUISIANA. 



A very notable enterprise of the New T Orleans Academy 

 of Sciences some years ago, in the absence of any state ar- 

 rangement for the purpose, was the initiation of the geolog- 

 ical survey of the State of Louisiana, with a view of obtain- 

 ing a general idea of its mineral resources, and of making 

 observations in regard to its agriculture, topography, and 

 natural history. Professor E. W. Hilgard, an eminent geolo- 

 gist and chemist (and, we believe, a brother of Professor J. 

 E. Hilgard, of the United States Coast Survey), volunteered 

 to take charge of the work, in which he was assisted by Dr. 

 J. P. Walker and Mr. F. Scott Miller. 



