Revieics — Dr. Molengraaff^ s Central Borneo. 167 



of occurrence, associations, etc., of specimens from one or two 

 typical localities. Much of the tabular matter, only necessary for 

 purposes of reference, is collected together in appendices. The 

 tables of minerals arranged according to their refractive index, optic 

 axial angle, specific gravity, etc., will be of great us© even to 

 working mineralogists. 



Finally, the printing and arrangement of the whole book leave 

 nothing to be desired, while a very complete and systematic table of 

 contents and an equally complete and well-arranged index add 

 much to the value of the work. The only drawback to the book is 

 its high price, which we are afraid will make a wide circulation 

 impossible. If the costliness of the work is due to the inclusion of 

 the coloured plates, we are of opinion that these had been better 

 omitted, since they represent only one type of interference figure 

 and form but an incomplete series. 



III. — The Borneo Expedition. 



Geological Explorations in Central Borneo, 1893-94. By 

 Dr. G. A. F. Molengraaff. With 89 Illustrations in the text, 

 56 Plates, 3 Maps, and an Atlas (folio) of 22 Geological Maps. 

 English Eevised Edition, with an Appendix on Fossil Radio- 

 LARiA of Central Borneo by Dr. G. J. Hinde. London : Kegan 

 Paul & Co., Ltd., 1902. Quarto : pp. xx, 530 ; Appendix, pp. 56, 

 pis. iv. Published by the Society for the Promotion of the 

 (Scientific Exploration of the Dutch Colonies. Leyden, E. J. 

 Brill ; Amsterdam, H. Gerlings. Issued February, 1903. Price 

 £2 12s. 6d. net. 



IT is with no common interest that we have studied the fine volume 

 of text and illustrations, and the large folio atlas of maps which 

 accompanies it, prepared by Dr. Molengraaff and printed in so 

 admirable a manner by our Dutch neighbours (in both an English 

 and a Dutch edition), an undertaking which, although warmly 

 supported by the Dutch Colonial Government, really results from 

 the enterprising spirit of " the Society for the Promotion of the 

 Scientific Exploration of the Dutch Colonies," and sets before our 

 own " Eoyal Colonial Institute " a splendid example which they 

 would do well to follow. 



A considerable delay has arisen in the production of this great 

 work owing to the fact that, soon after Dr. Molengraaff's return 

 to Europe from Borneo, in January, 1895, he was appointed State 

 Geologist to the Transvaal; the preface to the first Dutch edition 

 being dated from Pretoria, October 1st, 1899 ; that of the English 

 edition from Hilversum, March 25th, 1902 ; but this edition, 

 however, was not really issued until February, 1903. 



A glance at the map of Borneo conveys to the mind the idea 

 of vastness. It is one of the largest islands on the globe, being 

 next after New Guinea in extent, and only outrivalled in area 

 by two others, viz. Australia and Greenland, which usually rank 

 as continents. It lies across the equator (7° N. and 4° S.), forming 



