2 Art. 5.— Y. Totla: 



situated in the mountainous region bordering on the province of 

 Közuke. 



It lias also been found in a few places in the provinces of 

 Közuke, Shiinotsuke, Yamato, Yamashiro, and Musashi. 



The first important contribution to the study of the physio- 

 logy of Schistostega osmundacea was made by F. Noll (4) in the 

 year 1888. lie has shown that the curious phenomenon of the 

 moss emitting an emerald green light, depends on the peculiar 

 structure of the cells of the protonema. The latter are somewhat 

 ovoid and have on the elongated side from four to six chlorophyll 

 bodies, the main central part being filled with transparent, colour- 

 less cell-sap. The light passing into the cell along the optical axis 

 is so refracted that it falls on the chromatophores on the parabo- 

 loidal wall, so that it becomes brighter than when it comes in. 



The light that enters the cell outside the optical axis, however, 

 is not refracted in such a way that it directly reaches the 

 chromatophores, but makes a total reflection twice on the parabo- 

 loidal wall, and is refracted out again from the cell, taking a 

 direction parallel and opposite to that of its incidence. 



As the outcoming light passes through the chromatophores, it 

 appears not white, but strongly green. That the green light 

 given out by the moss is of a nature quite different from that of 

 phosphorescent light, has been fully established by Noll. 



After making further investigations on this phenomenon in 

 1908, Senn (7) came to the conclusion that the angle of in- 

 cidence made by the total reflection of the outer and the inner 

 rays of light on the back wall is 65° with the former, and 45° 

 with the latter, when the paraboloidal part of this cell wall has 

 an angle of 42-43°, and that, when the rays are reflected by 

 the opposite wall and sent out of the ceU in the direction of the 



