Reviews — Dr. B. Koio — Through Korea. 567 



The account of the Bolivian tin deposits might have been improved 

 by a reference to recent literature, even if its appearance was too late 

 to enable the authors to modify the text ; and again, the statement 

 that the percentage of thoria in monazite occasionally rises to 6 5 

 is hardly in accordance with published analj'ses. 



There is one defect in this book, however, that it is impossible 

 to pass by without protest, and that is the frequent and totally 

 unnecessary use of a termination that results in the terms 'acidic', 

 * sulj)hidic ', 'oxidic', and ' satellitic '. We know that this hideous 

 terminology did not originate with either of the authors ; and when, 

 some time ago, we saw it employed in an American magazine by one 

 of them, we thought it due to editing. But that was a mistaken view, 

 and we find now that we are expected to face vpith equanimity the 

 phrase "oxidic and sulphidic compounds". "Why not "oxides and 

 sulphides " ? On the other hand we are glad to see that the term 

 ' vadose ' occurs only once, and that as a quotation, 



J. B. S. 



V. — Journeys theough Korea. By Dr. Bundjiro Koto, Professor 

 of Geology in Tokyo. Journ. Coll. Sci., Imp. Univ., Tokyo, 1909, 

 vol. xxvi, article 2. 



SIX years ago attention was called in the Geological Magazine (for 

 1903, p. 324) to "An Orographical Sketch of Korea" by 

 Di\ Koto. The present memoir gives the results of further studies 

 and traverses of the country, and is accompanied by coloured geological 

 sections and map of South Korea, and by 33 pictorial plates. The 

 author refers to the pioneer work of Gottsche and Von Richthofen, the 

 former of whom has quite recently been lost to science (see p. 575 infra). 

 The geological formations met with are arranged in sequence as 

 follows : — 



Alluvium. 



Diluvium ami youuger efPusives. 



Tertiary. 



Felsophyre and its allies. 



Kyong-sang formation (Mesozoic). 



Great granitoid series. 



Phyllite schist (Metamorphic Mesozoic). 



Kang-jin mica-schist. 



Basal gneiss. 



Korea is described as a land of granite and gneiss, and it is to be 

 remarked that the age of the Phyllite schist has not been actually 

 determined to be Mesozoic ; it may, indeed, be very much older. 

 Great intrusions of granite took place subsequently, " shattering the 

 crust into diverse patches, and metamorphosing the sediments and 

 ancient lava-flows and dykes into schistose and foliated rocks." 



The lower portion of the Kyong-sang formation consists of red and 

 grey sandstones, and red, green, and black marls; and the upper part 

 of marls, shales, and breccia, all composed largely of igneous materials, 

 with a covering of green porphyrite accomp)anied by felsophyre. 

 Remains of plants, regarded as indicating the Malm-Dogger epoch of 



