140 B. KOTO 



portion gives an approximate idea of the appearance of the paramor- 

 phosecl portion of the diallage into amphibole. The hght]y shaded 

 part (a in the tig are) is that portion where, when seen under the 

 microscope, the hornblende sends out tongues and shreds of its own 

 substance into the diallage. 



Plate V. 



The map (as a basis for \vliich the " Middle Section " of the 

 reconnoissance map of topography of Japan, recently published by 

 the Geological Survey has been used) giving the area occupied by 

 the rocks of the Lower, Middle, and Upper Sambagawan, together 

 with the intrusive masses of gabbros, gabbro-diorites and serpentines. 

 The line OP indicates the main axis of the anticlinal ; while those 

 drawn across the Sambagawan belt signify the position of the profiles 

 given in Plates III and IV. 



Abbreviations of Geographical Names. 



