22 



Iwasaki : 



emanations are exuded, by the petrification of which ore-deposits 

 are formed. 



h. A definite process of deposition of emanations determines 

 the order of petrification, as stated in Section 3, p. 4. 



c. The ore-deposits of igneous origin may be classified into 

 five divisions; magmatic segregations, contacts, replacements, 

 mineral veins and impregnations. 



d. There are several kinds of igneous rocks called ore- 

 bringers, which produced the ore-deposits by their "eruptive 

 aft er- action." 



e. The Japanese empire is divided from the metallogenetic 

 point of view into five provinces, according to the difference of the 

 ore-bringers. They are as follows: — 



/. The minerals in the ore-deposits in the difïerent provinces 

 are distributed in the order of petrification as in the folloAving 

 table : — 



