332 Y. KIKUCHI. 



characteristic ; the greenish micaceous product fills up the whole 

 space of the crystal as irregular aggregates. A tendency to arrange 

 itself parallel to the base, as in the case of the Tamba specimens, is 

 not observed. The specimen from the last locality given above, 

 is the most interesting ; the crystals are in a quite fresh state, 

 but their development is rather rudimentary, consisting of finer 

 patches and threads, yet exhibiting on the whole the characteristics 

 already described. 



We have to mention one other occurrence in the Main Island, viz. 

 from Iriya-mura, Motoyoshi-gori, Prov.Rikuzen. It was also first 

 observed by Mr. K. Ji.mbo. Here the slate is converted, near a small 

 granitic boss, into a spotted slate looking exactly that developed in 

 the outer zone in the Watarase-gawa region. Under the microscope 

 the characteristic transverse section divided into six sectors may 

 occasionally be observed. The crystals are very small and can only 

 be detected under the microscope. 



N.B. — We read iu a recent number of the Neues Jahrbuch für 

 Mineralogie &c, (1889, Bd. I. p. 92, Referat, Original—" Ein Beitrag 

 zur Kenntniss der Knotenschiefer "in Verhandlungen des naturhistorischen 

 Vereins der Rheinlande u. Wastfalens, 44, 1887) that Dr. E. Hussak 

 lias investigated the microscopic characteristics of some of the contact 

 rocks chiefly of Germany. It is of interest to know that he 

 has found in the spotted slate (Knotenschiefer) of Tirpersdorf in 

 Saxony, an hexagonal section exhibiting the sectors, which he consid- 

 ers to be Cordierite. This is also found converted into a pseudomorph 

 resembling Finite. 



