TABLE OF CONTENTS. 



Article I. (969.) The Varieties of the Human Species. 

 By Giuseppe Sergi. 1894. Pp.61. 



Article II. (970.) Bibliography op Aceto Acetic Ester. 

 By Paul H. Seymour. 1894. Pp. x, 148. 



Article III. (971.) Indexes to Literatures op Cerium 

 AND Lanthanum. By W. H. Magee. 1895. 

 Pp. 43. 



Article IV. (972.) Index to Literature of Didymium. 

 By a. C. Langmuir. 1894. Pp. 20. 



Article V. (1075.) Recalculation of Atomic Weights. 

 New Edition. By Frank Wigglesworth 

 Clarke. 1897. Pp. vi, 370. 



Article VI. (1084.) Bibliography op Metals of Plati- 

 num Group: 1748-1896. By Jas. Lewis 

 Howe. 1897. Pp. 318. 



Article VII. (1090.) Review and Bibliography op the 

 Metallic Carbides. By J. A. Mathews. 

 1898. Pp. 32. 



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