14 B- Koto : 



events, the feldspars in the norms seem to enter largely into the 

 composition of our nephehne. A portion of water may be present 

 in combination with zeolitized products of the nepheline. 



The present rock is a simple unique nepheline-basalt in regard 

 to its mineralogical components. As it seems to me the present 

 rock is neither a plutonic nor a dyke-rock, I cannot call it a 

 shonkinite nor a monchiquite. Moreover, the. essential attribute of 

 alkah -feldspar is wanting in the Manchurian rock as to be classed 

 among the former, and a brown biotite and barkevikitic amphibole 

 is not present so as to be included among the latter. But I learn 

 from petrological literatures that each of both rocks assumes 

 various phases of crystallinity even within the same mass, ex- 

 tended researches of our Manchurian rock are necessary in regard 

 to its geognostic relation and chemical composition in order to 

 give the final decision as to what species it belongs. Since, how- 

 ever, in mineralogical composition and in appearance, it is most 

 closely related to nepheline-basalts, it is here referred to that 

 group. It is a noteworthy fact, especially in regard to the Sino- 

 Japanese region, that up to the present time no leucite-rocks have 

 ever been recoi'ded from north of the Philippine islands. 



My thanks are due to Mr. Swift, of our University, for read- 

 ing through my Englisli manuscript. 



Dcecuiher, 1911. 



