THE 
GHOLOGICAL MAGAZINE. 
NEW SERIESS DECADE Ih. VOL. 4X: 
No. VII.—JULY, 1893. 
OASIS racIN TAAL sy NaS ab Oa aa sh Se 
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I1.—Tue Votcanors OF Barren IstAND AND NARCONDAM IN THE 
Bay or BeEnGat. 
yar DAT One, HDs, ERS, 
Director of the Science and Art Museum, Dublin. 
Third Notice.' 
(PLATE XIII.) 
LTHOUGH it is now nearly twelve years since I left India, my 
interest has not abated in the scenes and subjects of former 
labours in that country, and I am still careful to note anything 
which is published in reference to them. This practice enabled me 
to add some facts to the history of the two above-named volcanoes 
in my Second Notice, besides quoting from the account by Mr. F. R. 
Mallet, the principal results of his survey made in conjunction with 
Captain Hobday, eleven years after my visit to them, which took 
place in the year 1873. 
It has always seemed to me to be somewhat unfortunate that no 
adequate representation of the peculiar forms of the crater and cone 
of Barren Island has hitherto been published ; and, as a consequence, 
the resemblance which this volcano bears to some of those on our 
satellite the Moon, though referred to, has never been effectively 
portrayed. In order to obtain such a representation I have had 
recourse to a device, the result of which will, I think, be admitted 
to be more satisfactory than the ideal sketches, from a bird’s-eye 
point of view, which have been published. 
Two or three years ago I had a model of the island constructed 
on the scale of 20 inches to a mile from data given in Mr. Mallet’s 
paper. This model has since been photographed, and by combining 
the negative with suitable sea and sky negatives, the picture now 
reproduced has been arrived at. 
Of course, on strictly artistic grounds, objection might be raised 
to the method which has been adopted ; but as this pictorial diagram 
represents with close approach to accuracy the appearance of the 
island as it might be seen from a balloon, it subserves in a very 
special degree the main object aimed at, and will, I trust, prove 
acceptable to all interested in volcanic phenomena, whether terrestrial 
or otherwise. Possibly too, the above description of the method 
1 First Notice, Grou. Mac. Vol. VI. 1879, pp. 16-27. Second Notice, Gxou. 
Mae. Dee. III. Vol. V. 1888, No. IX. p. 404. 
DECADE III.—yOL. X.—NO. VII. 19 
