14 GEOLOGICAL RECONNAISSANCE OF THE DOMINICAN REPUBLIC. 



than has hitherto been available, and we may reasonably hope that its 

 publication will be of some service. The other condition is the uncertainty 

 regarding the continuity of personnel in the investigations. Mr. Condit 

 resigned from the United States Geological Survey in October, 1919, to 

 enter upon private commercial work, and later Messrs. Cooke and Ross both 

 applied for furloughs for similar work. Under such conditions it is obvious 

 that the information obtained through the preliminary studies should be 

 put into such form as to make it available for geologists, whether working 

 for the Government or privately, and as a consequence of these conditions 

 this volume is issued. 



Several members of the Geological Survey and others have assisted in the 

 office study of the field data and collections. The chemical analyses of 

 samples of water were made in the water-resources laboratory of the United 

 States Geological Survey under the direction of Mr. C. H. Kid well, formerly 

 chief of the division of quality of water, and analyses of samples of other 

 kinds were made in the chemical laboratory of the Geological Survey under 

 the direction of Mr. George Steiger, chief chemist. The specimens of igne- 

 ous and met amorphic rocks were determined by Mr. F. C. Calkins, geol- 

 ogist of the Geological Survey, and the chapter on economic geology was 

 reviewed by Mr. H. G. Ferguson, also geologist of the Geological Survey. 

 Specimens of rock and clay-sand were tested by the Bureau of Public Roads, 

 United States Department of Agriculture. The very large paleontologic 

 collections were sorted into groups and distributed to specialists for study 

 and report. A list of the names of those who cooperated in the study of this 

 material is given on page 89. 



Although the chapters of this volume bear authors' names, it is not 

 possible, in a product which is the result of the cooperative efforts of a group 

 of workers, to designate exactly the share done by any one, and such a 

 designation is probably of no great importance. The authors' names 

 indicate those who devoted most attention to the preparation of the several 

 chapters, but Dr. W. P. Woodring and I have reviewed the entire volume 

 and have endeavored to see that the different parts of the report are ac- 

 cordant with one another. This has been a considerable task, as it had 

 to be done in the absence of Messrs. Condit, Cooke, and Ross. 



The preparation of the Spanish text has been a task of no small difficulty, 

 because of the great number of technical terms employed. The book was 

 rendered into Spanish by Sefior E. M. Amores, chief translator of the Pan 

 American Union, and the translation was carefully compared with the 

 English original by Doctor Cooke. The quality of the result can best be 

 judged by the reader. In justice to both these gentlemen it should be 

 stated that the legends for the maps were written and draughted during 

 Doctor Cooke's absence from the United States and before Sefior Amores' 

 services were engaged. The numerous errors in the Spanish legends were 

 not detected until it was too late to correct them. 



