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the ground as to render it liable to be mistaken for Pinus 
pumila* 
In such high regions, Pinus pumila generally ranges over 
all the mountains of Japan. But on this mountain we have 
not found this pine thus far. The absence of the Pinus is 
worthy of special attention. 
Considering the wind direction on the high mountains, where 
Pinus pumila grows, we find that the prevailing wind is south- 
westerly. But, of the neighbouring mountains which lie on 
the south-west of Mt. Fuji, there is none sufficiently high to 
support the Pinus. Therefore, the volcano lias had no chance 
to get the seeds of Pimis pumila, by the southwesterly wind, 
and this may be considered to be the cause of the absence of this 
tree on Mt. Fuji. 
VIII. SUMMARY. 
In the course of my several visits to the mountain, I have 
determined the difference of its vegetation according to altitude 
and exposure. So far as the exposure alone is concerned, the 
vegetation may be divided into two classes : — the northern and 
southern. On the northern slope, the conifer predominates, 
while on the south, the deciduous trees are in control. To 
ascertain the cause of this divergence, I have examined the 
physiography of the mountain and found that the divergence 
may be ascribed to the difference of the climatic factors, and 
principally to that of the saturation-deficits on the two sides. 
Next, I have considered the general aspect of the plant-formation, 
dividing the whole mountain into four parts, and describing 
* The Pinus was erroneously recorded from the mountain by some authors. 
