6 PREFACE 



wells and have accurately located them on the map. The 

 chapter on gypsum is based on the field notes of Mr Clarke. 



The writer has also consulted the following works: 



Johnston's Encyclopaedia, Article Salt, by Chas. A. Goess- 

 man ; Elemente der Geologie, H. Credner, 6te Auflage ; 

 Chemische Technologie, R. von Wagner, lite Auflage; 

 Geology of the 3rd Dist. of N. Y. State, L. Vanuxem; 

 Geology of the 4th Dist. of N. Y., James Hall. 



Prof. I. P. Bishop's article on salt in New York State 

 published in the report of the State Geologist for 1884, has 

 been freely quoted and also the articles of Dr F. E. Engle- 

 hardt in the Annual Reports of the Superintendent of the 

 Onondaga Salt Reservation. 



The brief historic sketch of the discovery of the Onondaga 

 brines by the Jesuit missionaries has been translated from 

 the original Relations, and, for the early history of salt 

 manufacture, Clarke's Onondaga has been consulted. 



For information collected by the writer and his assistants 

 the former desires to express his thanks to the salt companies 

 and their representatives and to the proprietors of the gyp- 

 sum quarries, and it is hoped that they will take sufficient 

 interest in the work to notify him of any errors in this 

 bulletin and to supply him with any new information they 

 may possess. 



FREDERICK J. H. MERRILL. 



