Art. 5.— Y. Toda: 



where the Schîstostega was known to thrive, I made some observations 



on the natural conditions of these places, all of wliicli are in the 



province of Shinano. The differences in the intensity of light, in 



the humidity, and in the 



temperature in and out of 



the caves were carefully 



estimated. 



Natural Conditions of 

 the Caves. — Tlie caves 

 in which the moss is 

 found, consist of augite 

 andésite (in 21 places), of 

 granite (in 12 places), of 

 clay-slate (in places), of 

 shale (in 3 places), of 

 diluvium formation (in 3 

 places), and of other kinds 

 of rock (in about 14 

 plac-s). Possibly a vol- 

 canic rock like andésite, 

 whicli is very easily weath- 

 ered affords the best con- illustration l. a crevice unùer a crag o£ biolite 



granite in Mt Komagadake, at an elevation of 1900 m. 

 ditlOnS for the growth of showing the natural occurrence of Scfdstosleija osmundacea. 

 . , X shows the spot where Vouk's Photometer was placed. 



the moss. 



1. Mt. Komagadake, — In this granitic mountain the moss 

 occurs in small caves as well as in holes formed at the foot of 

 fallen dead trees, at a height of 1850-2400 m. above the sea-level 

 (see illustration 1). 



The soil of these places consists of weathered rocks and de- 

 composed vegetable matter. The caves m.ostly face a direction 



