422 



Revieics — Dr. Nansen's North Polar Sea. 



are similar to the granitic rocks described above, but without the 

 characteristic accessory minerals. There is a considerable exposure 

 of reddish granite on the Katnapura road about a mile below 

 Balangoda, and this is known as a locality for 'graphic granite.' 

 A tendency to graphic structure was noticed in many of the rocks 

 already described. Smaller masses (dykes) are common at Dik 

 Mukulana (11 miles from Balangoda) and on Hopewell estate, 



Fig. 2. — Structure of allanite granite ; Deuagama estate, Balangoda. A, allanite ; 

 B, biotite ; 0, orthoclase ; remainder quartz and felspar. Present 

 scale, X 5.2 times. 



15 miles from Balangoda, and at many other points. These granites 

 (as well as others containing zircon) are also well exposed on 

 Herimitegala estate, about 8 miles from Balangoda. 



The list of types of rock belonging to the Balangoda group 

 actually met with is now exhausted. There can be no doubt that 

 many other varieties will be found, and it is evident that some are 

 likely to be of great interest. Since, however, detrital zircon is 

 exceedingly abundant, yet is known in sitil in a few localities only, 

 it is clear that the chance of finding any particular one of the other 

 and rarer minerals in situ must be rather small. 



la E "V I E '^<^ S. 



I. — Dr. Fkidtjof Nansen's Researches into the Bathymetrioal 

 Features of the North Polar Seas.^ 



THIS elaborate volume is the outcome of Dr. Nansen's Arctic 

 Explorations, of which we have narratives in his " First Crossing 

 of Greenland" (1890) and his "Farthest North" (1897), both 



^ Published by the Fridtjof Nansen Fund for the Advancement of Science (with 

 29 plates). Christiania, 1904. 



