230 NATURAL SCIENCE. Sept.. 1893. 



brief, is dated Ma}', 1892, and is mainly descriptive of the plates 

 which follow. These plates are so remarkable in execution, and so 

 true in colouring, that it is scarcely an exaggeration to say that they 

 are as good as the implements themselves. The extraordinary 

 markings, so familiar on broken flints, are here produced in a most 

 perfect and striking manner ; indeed, we had scarcely hoped that 

 chromolithography had reached so high a degree of excellence. 

 MM. Pilloy and Bourbier, for their names must be linked together in 

 this beautiful production, have evidently worked for the love of their 

 subject, and whether we regard these plates from the point of view of 

 draughtsmanship or from that of artistic skill in printing, they have 

 given us results of which they may be justly proud, and which, 

 instead of being buried in our bookshelves, should rather find a place 

 upon our walls. 



Republication of Conrad's Fossil Shells of the Tertiary Formations of 

 North America. By Gilbert Dennison Harris. 8vo. Washington : May, 

 1893. Price 3 dels, (after November i, 3.50 dels.) 



Closely following on Dr. Ball's collation of Conrad's works, Mr. 

 Harris, who has devoted much time and labour to the collation of 

 these rare publications, has issued an exact reprint of the text, and 

 facsimile of the plates, of one of them. Mr. Harris was largely 

 responsible for the facts in Ball's work, and has received full acknow- 

 ledgment in the preface. Now that we are in possession of Conrad's 

 paper, many doubtful points in the identification of species of American 

 Tertiary fossils will be cleared up, and without entering into contro- 

 versy as to the actual dates of publication of the parts of this work, 

 we feel that the thanks of all palaeontologists are due to Mr. Harris, 

 in reproducing for us a book so rare, that it could only be compiled 

 from fragmentary and incomplete copies of the original. 



Catalogue of South Australian Minerals, with the Mines and other Localities 

 where found ; and brief remarks on the mode of occurrence of some of the 

 principal metals and ores. By H. Y. L. Brown. 8vo. Pp. 36. Adelaide: 



1893. 



This Catalogue supplants that of Gbyder issued in 1883, ^^^ ^^ 

 intended to supply miners, prospectors, and others, with a record of 

 mineral discoveries for convenient reference. The author does not 

 pretend that it is exhaustive, as many private collections which 

 possibly contain minerals are unavailable. The Catalogue is 

 arranged in alphabetical order, and in each case consists of the 

 name of the mineral, followed by a list of the localities. 



We understand that Messrs. Cassell & Co. have resolved to dis- 

 continue the issue of the Year Book of Science. Only two annual 

 volumes (1891, 1892) have been pubhshed. 



