PREFACE. 



All " Index to the Literature of Zirconium " was begun inde})en(lently 

 l)y tlie two authors. Learning of this, and in order to avoid furtlier 

 unnecessary duplication, it was decided to combine the references then 

 on liaiid and to divide tlie remaining ]al)or. The resulting product is 

 thought to contain most of the important references to the element, and 

 is offered to the Committee of the American Association for the Ad- 

 vancement of Science on Indexing Chemical Literature in hopes of its 

 ])roving of value. The references are brought up to Januaiy 1st, 1899. 



Besides our private libraries, we have sought references to the subject 

 in the lil)raries of Columbia, Johns Hopkins, and the North Carolina 

 Universities and the North Carolina Geological Survey. To the gen- 

 tlemen in charge of these libraries we wish to extend our thanks for 

 their courtesy and co-operation. 



A. C. Langmuie, 

 C. Baskerville. 



April. 1S99. 



