570 Itemews — JuJces-Broivne's Physical Geology. 



both AUuvIal and Diluvial deposits, and in the older rocks (No. 1). 

 Diamonds occur in the Post-Tertiary deposits, but have not yet 

 been found in situ. Platinum and ores of Antimony, Mercury, Iron, 

 Copper, and Silver, have been obtained. Ores of Lead and Zinc 

 occur, but it is said that they will not pay for wrorking. Various 

 other ores have also been found. The occurrence of Salt-beds is 

 noted, and there are also Warm Springs. 



The notes appended to the work by the author should have been 

 inserted in their proper place in the body of the work by the editor, 

 and he would have greatly added to its usefulness if he had provided 

 an index. The chief value of the work will be in reference to the 

 Economic Geology of the Island ; but scientific explorers will find 

 it of great service on all matters connected with the Geology of 

 Borneo, 



III. — The Student's Handbook of Physical Geology. By A. J. 

 Jukes-Browne, B.A., F.G.S. Second Edition. (London : George 

 Bell & Sons, 1892.) Price 7s. 6d. 



THE first edition of this work was briefly noticed in the Geological 

 Magazine for 1884 (p. 461). Daring the eight years that have 

 elapsed much information has been gathered on the subjects dealt 

 with by the author, and he has enlarged his work, more especially 

 with reference to Volcanoes, the processes of Disintegration, Oceanic 

 deposits, Metamorphism. and Mountain-building. Faults and flexures 

 receive additional illustration in the matter of thrust-planes. We 

 are not altogether confident that the author has done wisely to 

 increase the bulk of his volume from 514 to 666 pages. His aim, 

 as stated in the first edition, was to provide a book of modest 

 pretentions, at a moderate price, for the use of geological classes. 

 Even then, with the volume dealing with Historical Geology, the 

 student had to encounter over eleven hundred pages before he had 

 traversed the field of geology traced out for him ; and it is difficult 

 to get students to read big books. Be this as it may, the author has 

 brought his work up to date in a most painstaking manner ; and the 

 reader will find a full account of the geological agencies now in 

 operation, of rocks and rock-masses, and of the processes which 

 have led up to the present physical configuration of the earth's 

 surface. 



Tlie author objects, as others have sometimes objected, to the use 

 of the word Denudation ; but to supplant a familiar and well- 

 understood term is no easy matter. One authority has proposed 

 to establish the word 'Abrasion;' Mr. Jukes-Browne proposes the 

 word 'Detrition.' One of the stumbling-blocks introduced into 

 modern Geology is the attempt to change well-known names, 

 whether in Physical Geology, Stratigraphy, or Palaeontology. 

 Changes may not affect the student in his days of class-learning, 

 but when he becomes a worker, he must learn the old as well as 

 the new terms, and every addition, whether useful or otherwise, 

 must needs be a burden. 



