PREFACE. 



This bibliography, which is the result of five years of research, 

 is based largely on facilities afforded by the libraries of the Amer- 

 ican Museum of Natural History and of the New York Academy 

 of Sciences, — facilities which are not enjoyed by many scientific 

 students. At the beginning I had no idea of presenting this 

 work to the scientific Avorld. When I began the study of the 

 foraminifera I had no knowledge whatever of that which had 

 been done in this branch of science. After I commenced look- 

 ing up the subject the references accumulated so rapidly that I 

 thought it might be well to collect and put them in shape so that 

 they might be useful to others as well as to myself. 



After three years' labor I applied to Mr. H. B. Brady, P. R. S., 

 for information pertaining to the subject. He at once informed 

 me that he had in press a bibliography of the sai^e character, 

 and kindly offered to give me any assistance he could. 



When the British Association for the Advancement of Science 

 met at Montreal, in 1884, I met in New York Mr. James Thom- 

 son, F. G. S. , a member from Scotland, to whom I spoke of my 

 work, asking his advice about proceeding with it. He urged me 

 to continue, and to finish it, as it would become accessible to a 

 great number of workers who could not possess the valuable 

 monograph of Mr. H. B. lirady. 



I do not presume that this list is complete; since titles are 

 liable to be found in obscure publications tliat have not fallen 



4iJ()li92 



