S57 
Dr Tilesius on the Volcano of Coosirna. 
west of the island there is abundance of sea-tangle (sea-tang^ 
Fucus), which the Japanese call comhu^ and which they use for 
food.” 
Should this small contribution towards a more intimate ac- 
quaintance with the volcanoes in the Archipelago of Japan, 
obtain the approbation of geographers, I shall add some other 
sea views from Volcano Bay. I have considered the present to 
be especially worthy of being communicated, because, 1st, This 
volcano is probably the smallest in the world ; 2d, Because it 
seldom happens that European sailors are permitted, by calms, 
to take advantage of the stream which flows round this rock ; 
1 3d, Because it is equally rare that any person can sail round 
the island, and so near to it, that all the objects on it can be 
distinctly discerned, and that it can be described and drawn 
from all sides ; 4th, Because its small size presents it to us as a 
volcano in embryo^ and secures to us so clear and complete a 
view of it, that we are in a situation to examine the construc- 
tion and entire composition of the island ; to look at its spira- 
culae apd cavities, which arc opened to the entrance of the wa- 
ter, and thus to explain the elevation and formation of the vol- 
cano; and, ^thj Because the volcanoes of the Japanese Archi- 
pelago are not yet generally known, since Maltebrun, whom 
Krusenstern’s illustrations of this part of Japan might have 
better insti'ucted, mentions only the volcanoes of jPico and FV- 
cjando. 
Explanation qf Plate XI. 
Fig. 1. This is a view of the rock Coosima, or the' nearer is-^ 
land, seen at the distance of half a league from our ship^ 
after its position, N. W, 70 by the needle, had been 
marked, on the 4th May 1805, at 10 o’clock A. M. It 
is here seen divided at the top. In the cavity between the 
parts we observed volcanic ashes ; and, farther down, spi- 
raculae, apd all the marks of lava having flowed. 
Fig. 2. In this pjate we have a nearer view of the rock, and 
see it undivided, or from the smaller size ; it lies now 
more directly over against Matipai, W, 4°.27'. It was 
sketched on the 4th May, at lO^ 18*" A. M. 
